US3459127A - Methods of correcting typing errors - Google Patents

Methods of correcting typing errors Download PDF

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US3459127A
US3459127A US614615A US3459127DA US3459127A US 3459127 A US3459127 A US 3459127A US 614615 A US614615 A US 614615A US 3459127D A US3459127D A US 3459127DA US 3459127 A US3459127 A US 3459127A
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sheet
master
hectographic
correction
error
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Victor Barouh
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/26—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling
    • B41J29/36—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling for cancelling or correcting errors by overprinting

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  • This invention relates generally to hectographic methods, and articles .and compositions for use therein, and to a method of correcting hectographic material.
  • Hectographic reproduction has heretofore been recognized as having certain disadvantages, for example, the absence of an immediate copy of the original, and the diflicult, if not possible, task of correcting mistakes on the master and the original.
  • a further object of the invention resides in the provision of a novel unit for hectographic reproduction which can be easily introduced into a typewriter.
  • Still further objects of this invention reside in the provision of hectographic material that is simple and inexpensive to manufacture thereby permitting wide use .and distribution.
  • FIG. 1 is a perspective view illustrating a spirit master unit constructed in accordance with the teachings of the instant invention for use in hectographic reproduction;
  • FIG. 2 is a perspective view illustrating the first of successive steps in the correction of an error in making a hectographic master in .accordance with the concepts of the invention, and showing a typewritten error;
  • FIG. 3 is a perspective view illustrating the unit in a typewriter with the sheets of the unit separated
  • FIG. 4 is a perspective view illustrating a correction sheet applied to the hectographic coating
  • FIG. 5 is a perspective view illustrating the master sheet returned to facing relation with the carrier sheet
  • FIG. 6 is a perspective view illustrating a correction sheet applied on the master sheet
  • FIG. 7 is a perspective view illustrating the condition of the master sheet after the error has been retyped
  • FIG. 8 is a perspective view illustrating the condition of the carrier sheet after the error has been retyped
  • FIG. 9 is a perspective view illustrating the application of a patch on the carrier sheet.
  • FIG. 10 is a perspective view illustrating the condition of the master sheet after correct typing.
  • a spirit master unit is there generally designated 20, and includes a master sheet 21, a copy sheet 22 in underlying facing relation with the master sheet, and an intermediate carrier sheet 23 interposed between the master and copy sheet.
  • the several sheets 21, 22 and 23 are detachably joined together along one set of adjacent edges by suitable means 29.
  • the master sheet 21 may be of suitable sheet material, preferably of a 6(l-lb. basic stock coated on two sides with a 15%-casein coating.
  • the copy sheet 22 may be of a suitable material, preferably a tissue of 15-lb. weight with a machine-glazed finish on one or both sides.
  • the intermediate or carrier sheet 23 may preferably be a 40-lb. basic stock, and is provided on one surface, facing toward the master sheet 21, with a coating 24 of hectographic reproducing material pressure-transferable to the adjacent face 27 of the master sheet.
  • the hectographic coating 24 is preferably of a conventional spirit formula, and of any desired color.
  • a coating 25 which preferably is of pressure-transferable carbon for pressure transference to the adjacent surface 28 of the copy sheet.
  • the carrier sheet 23 is provided on its respective opposite surfaces with coatings of pressure-transferable hectographic material and carbon material.
  • the unit 20 includes only three superposed sheets, the master sheet 21, copy sheet 22, and intermediate carrier sheet 23.
  • an interleaver or removable protective sheet may be interposed between the master and carrier sheets.
  • the assembled unit 20 is placed in a typewriter with either end being inserted first and in a position to type an original on the outer face 26 of the master sheet 21.
  • the pressure of typing will cause transfer of hectographic coating material 24 to the inner surface 27 of the master sheet 21 to provide for a mirror image. In this manner, the inner surface 27 of master sheet 21 becomes a spirit master for hectographic reproduction.
  • the typing pressure causes transfer of carbon coating material 25 from the carrier sheet 23 to the top surface 28 of the copy sheet 22, so that the copy sheet 22 becomes an immediate and exact copy of the original on surface 26 of master sheet 21, which may subsequently be hectographically reproduced from the spirit master of master-sheet surface 27.
  • the hectographic unit is there generally designated 30, and includes a master sheet 31 and a carrier sheet 32 and a copy sheet 33, which may be respectively identical to the master, carrier and copy sheets 21, 22 and 23 of FIG. 1.
  • the unit 30 is shown inserted in a typewriter 35, and typed material is illustrated therein as being in error.
  • the master, carrier and copy sheets 31, 32 and 33 partially withdrawn from but remaining in the typewriter 35, the sheets are separated at the location of the error, as shown in FIG. 3.
  • the rear, inner or spirit master face 36 of the master sheet 31 is exposed to present the erroneous spirit master copy. Also exposed is the hectographic-material-coated surface 37 of the carrier sheet 32.
  • a correction sheet 38 is shown in FIG. 4 as covering the location of error on the hectographic coating 37 of carrier sheet 32. It should be noted that a pressuretransferable coating is provided on the surface 39 of the correction sheet 38 facing away from the carrier sheet 32.
  • the master sheet 31 may then be returned into facing relation with the carrier sheet 32, the correction sheet 38 being interposed therebetween.
  • Another correction sheet 40 is arranged over the front or outer surface of the master sheet 31, covering the error typed thereon, a third correction sheet, similar to correction sheet 40, is arranged between the carrier sheet 32 and copy sheet 33 covering the error thereon, and the several sheets, master sheet 31, carrier sheet 32, copy sheet 33, and correction sheets 38 and 40 are together returned to the typewriter position of the error.
  • This condition is shown in FIG. 6.
  • the error may then be retyped as illustrated in FIGS. 7 and 8. That is, the exact copy of the error is retyped, and transferable coatings from the correction sheets 38 and 40 are thereby transferred to the outer and inner surfaces of the master sheet 31 to cover and obscure the previously made error. This returns the surfaces of the master sheet to their apparent condition prior to the error.
  • the correction sheet or patch 42 is provided on its surface facing away from carrier sheet 32 with a coating of hectographic material 43. This will insure full lines in the corrected spirit master. In the absence of correction sheet 42, the previously typed error region having removed some of the hectographic coating material 37 from the sheet 32, broken lines might result in the corrected copy. Thus, with the correction sheet 42 in position, the operator may proceed to complete the hectographic master, as shown in FIGS. and 11.
  • the correction sheet 40 for use on the front of the master sheet 31 to correct the original thereof is coated on its surface facing the master sheet with a pressure-transferable pigmented coating.
  • the coating may consist of a mixture of titanium-dioxide and magnesium-silicate pigments in a polyvinyl-chloride-polyvinyl-acetate polymer-resin binder.
  • the transferable coating may be a mixture of polyvinyl-chloridepolyvinyl-acetate copolymer resin and 3-8% by weight resin, together with a mixture of titanium-dioxide and magnesium-silicate pigments.
  • the correction sheet 38 for correcting the hectographic master on the rear or inner surface of the master sheet 31 is formed from a lacquer comprising of about 50- 60% solids and 40-50% volatile solvents, by weight. In practice, a satisfactory mixture has been 58.1% solids and 41.9% volatile solvents, by weight.
  • the solids consist of about 89-96% pigments, 13% polyvinyl-chloridepolyvinyl-acetate copolymer, and about 110% gilsonite, all by weight.
  • a preferred formulation of the solids is 96 parts pigment to 4 parts binder.
  • the pigments include 75 parts titanium dioxide, 24.5 parts magnesium silicate and 0.5 part graphite.
  • the binder is a mixture of 3 parts polyvinyl-chloridepolyvinyl-acetate copolymer and 1 part gilsonite.
  • the solvent portion is a mixture of solvents such as methyl ethyl ketone and toluene in approximately equal amounts.
  • the inclusion of gilsonite has been found remarkably advantageous in covering and sealing the corrected hectograph-dye or -material error area.
  • the above has discussed the correction of a typed error.
  • the above correction-material coatings may be employed to correct other than typed errors, such as line drawings, etc.
  • the corresponding correction material in liquid form may be brushed over the hectographic-dye impression and over the front or original side of the master sheet. Upon drying, the error is covered, and the master may be finished.
  • the present invention provides a unique method of error correction in hectographic procedures, and articles and compositions for use therein, which fully accomplish their intended objects and are well adapted to meet practical conditions of manufacture and use.
  • a method of correcting a mistyped hectographic master sheet and copy sheet being typed with a hectographic and carbon-coated intermediate sheet comprising the steps of providing a first correction sheet having a pressure transferable pigmented coating on one face, placing said first correction sheet in front of said master sheet with said coating adjacent to said master sheet, providing a second correction sheet having a pressure transferable lacquer comprised of 8996% pigment and 114% binder, said pigment containing 75 parts of titanium dioxide, 245 parts of magnesium silicate and 0.5 part of graphite on one face, placing said second correction sheet between said master and intermediate sheets with said lacquer adjacent to said master sheet, providing a third correction sheet having a pressure tranferable pigmented coating on one face, placing said third correction sheet between said intermediate and copy sheets with its pigmented coating adjacent to said copy sheet, retyping the error to transfer said coatings and lacquer to said master and copy sheets, removing said correction sheets, then inserting a patch having a hectographic coating against said intermediate sheet
  • said binder comprises about 13% by weight polyvinyl chloridepolyvinyl acetate co-polymer, and about 1-10% by weight of gilsonite.

Description

Aug. 5, 1969 v. BAROUH METHODS OF CORRECTING TYPING ERRORS 2 Sheets-Sheet 1 Filed Feb. 8, 1967 FIG. 5
INVENTOR.
VICTOR BAROUH ATTORNEY 1969 v. BAROUH 3,459,127
METHODS OF CORRECTING TYPING ERRORS Filed Feb. 8, 1967 2 Sheets-Sheet 2 FIG. 17
43 FIG. 9
0 32 =37 .'l v WI; 3/ .36
INVENTOR.
VICTOR BAROUH ATTORNEY United States Patent Office 3,459,127 METHODS OF CORRECTING TYPING ERRORS Victor Barouh, 935 Plum Tree Road, Westbury, N.Y. 11590 Filed Feb. 8, 1967, Ser. No. 614,615 Int. Cl. B41m /00; B41n 3/00; B411 47/02 US. Cl. 101-463 2 Claims ABSTRACT OF THE DISCLOSURE A method of correcting a mistyped hectographic unit, the unit including a master sheet, a carrier sheet, and a copy sheet. Hectographic means are provided on one face of the carrier sheet facing the master sheet and carbon transfer material is disposed on the other face of the carrier sheet facing the copy sheet. The method is carried out 'by using a first correction sheet having a pressuretransferable pigmented coating thereon and a second correction sheet having a pressure-transferable lacquer thereon, and by suitably placing the correction sheets to correct any errors.
This invention relates generally to hectographic methods, and articles .and compositions for use therein, and to a method of correcting hectographic material.
Hectographic reproduction has heretofore been recognized as having certain disadvantages, for example, the absence of an immediate copy of the original, and the diflicult, if not possible, task of correcting mistakes on the master and the original.
Accordingly, it is an important object of the present invention to provide hectographic methods, articles and compositions which cure the above-mentioned difliculties, afford an immediate carbon copy of the original without hectographic reproduction thereof, and enable an operator to quickly, neatly .and easily correct mistakes on the original, master and carbon copy.
A further object of the invention resides in the provision of a novel unit for hectographic reproduction which can be easily introduced into a typewriter.
Still further objects of this invention reside in the provision of hectographic material that is simple and inexpensive to manufacture thereby permitting wide use .and distribution.
Other objects of the present invention will become apparent upon reading the following specification and referring to the accompanying drawings, which form a material part of this disclosure.
The invention accordingly comprises the features of construction, and combination and arrangements of elements and method steps, which will be exemplified in the construction hereinafter described, and of which the scope will be indicated by the appended claims.
In the drawings:
FIG. 1 is a perspective view illustrating a spirit master unit constructed in accordance with the teachings of the instant invention for use in hectographic reproduction;
FIG. 2 is a perspective view illustrating the first of successive steps in the correction of an error in making a hectographic master in .accordance with the concepts of the invention, and showing a typewritten error;
FIG. 3 is a perspective view illustrating the unit in a typewriter with the sheets of the unit separated;
FIG. 4 is a perspective view illustrating a correction sheet applied to the hectographic coating;
FIG. 5 is a perspective view illustrating the master sheet returned to facing relation with the carrier sheet;
FIG. 6 is a perspective view illustrating a correction sheet applied on the master sheet;
3,459,127 Patented Aug. 5, 1969 FIG. 7 is a perspective view illustrating the condition of the master sheet after the error has been retyped;
FIG. 8 is a perspective view illustrating the condition of the carrier sheet after the error has been retyped;
FIG. 9 is a perspective view illustrating the application of a patch on the carrier sheet;
FIG. 10 is a perspective view illustrating the condition of the master sheet after correct typing; and
FIG. 11 is a perspective view illustrating the condition of the carrier sheet after correct typing.
Referring now more particularly to the drawings, and spectifically of FIGURE 1 thereof, a spirit master unit is there generally designated 20, and includes a master sheet 21, a copy sheet 22 in underlying facing relation with the master sheet, and an intermediate carrier sheet 23 interposed between the master and copy sheet. The several sheets 21, 22 and 23 are detachably joined together along one set of adjacent edges by suitable means 29.
The master sheet 21 may be of suitable sheet material, preferably of a 6(l-lb. basic stock coated on two sides with a 15%-casein coating. The copy sheet 22 may be of a suitable material, preferably a tissue of 15-lb. weight with a machine-glazed finish on one or both sides.
The intermediate or carrier sheet 23 may preferably be a 40-lb. basic stock, and is provided on one surface, facing toward the master sheet 21, with a coating 24 of hectographic reproducing material pressure-transferable to the adjacent face 27 of the master sheet. The hectographic coating 24 is preferably of a conventional spirit formula, and of any desired color. On the other surface of the intermediate carrier sheet 23, adjacent to the copy sheet 22, there is provided a coating 25, which preferably is of pressure-transferable carbon for pressure transference to the adjacent surface 28 of the copy sheet.
Thus, the carrier sheet 23 is provided on its respective opposite surfaces with coatings of pressure-transferable hectographic material and carbon material. In the illustrated embodiment, the unit 20 includes only three superposed sheets, the master sheet 21, copy sheet 22, and intermediate carrier sheet 23. However, if desired, an interleaver or removable protective sheet, not shown in the drawing, may be interposed between the master and carrier sheets.
In order to produce a hectographic master, the assembled unit 20 is placed in a typewriter with either end being inserted first and in a position to type an original on the outer face 26 of the master sheet 21. The pressure of typing will cause transfer of hectographic coating material 24 to the inner surface 27 of the master sheet 21 to provide for a mirror image. In this manner, the inner surface 27 of master sheet 21 becomes a spirit master for hectographic reproduction.
Simultaneously, the typing pressure causes transfer of carbon coating material 25 from the carrier sheet 23 to the top surface 28 of the copy sheet 22, so that the copy sheet 22 becomes an immediate and exact copy of the original on surface 26 of master sheet 21, which may subsequently be hectographically reproduced from the spirit master of master-sheet surface 27.
In the production of the hectographic master, as described hereinbefore, it is not uncommon that an error be typed, such as a misspelling, or the like. In the past, an error may have required discarding of the entire unit and retyping. However, in accordance with the present invention, correction of the several components of the unit may be readily accomplished to effect considerable savings in time and materials.
Such error correction is illustrated in FIGS. 2-11. However, in the embodiment of FIGS. 211, the hectographic unit is there generally designated 30, and includes a master sheet 31 and a carrier sheet 32 and a copy sheet 33, which may be respectively identical to the master, carrier and copy sheets 21, 22 and 23 of FIG. 1.
The unit 30 is shown inserted in a typewriter 35, and typed material is illustrated therein as being in error. With the master, carrier and copy sheets 31, 32 and 33, partially withdrawn from but remaining in the typewriter 35, the sheets are separated at the location of the error, as shown in FIG. 3. Thus, the rear, inner or spirit master face 36 of the master sheet 31 is exposed to present the erroneous spirit master copy. Also exposed is the hectographic-material-coated surface 37 of the carrier sheet 32.
A correction sheet 38 is shown in FIG. 4 as covering the location of error on the hectographic coating 37 of carrier sheet 32. It should be noted that a pressuretransferable coating is provided on the surface 39 of the correction sheet 38 facing away from the carrier sheet 32.
The master sheet 31 may then be returned into facing relation with the carrier sheet 32, the correction sheet 38 being interposed therebetween.
Another correction sheet 40 is arranged over the front or outer surface of the master sheet 31, covering the error typed thereon, a third correction sheet, similar to correction sheet 40, is arranged between the carrier sheet 32 and copy sheet 33 covering the error thereon, and the several sheets, master sheet 31, carrier sheet 32, copy sheet 33, and correction sheets 38 and 40 are together returned to the typewriter position of the error. This condition is shown in FIG. 6. The error may then be retyped as illustrated in FIGS. 7 and 8. That is, the exact copy of the error is retyped, and transferable coatings from the correction sheets 38 and 40 are thereby transferred to the outer and inner surfaces of the master sheet 31 to cover and obscure the previously made error. This returns the surfaces of the master sheet to their apparent condition prior to the error.
Before continuing to complete the hectographic master, it is desirable to provide an additional correction sheet or patch 42 covering the location of the previous error on the hectographic-material-coated surface 37 of carrier sheet 32. As shown in FIG. 9, the correction sheet or patch 42 is provided on its surface facing away from carrier sheet 32 with a coating of hectographic material 43. This will insure full lines in the corrected spirit master. In the absence of correction sheet 42, the previously typed error region having removed some of the hectographic coating material 37 from the sheet 32, broken lines might result in the corrected copy. Thus, with the correction sheet 42 in position, the operator may proceed to complete the hectographic master, as shown in FIGS. and 11.
As noted hereinbefore, the correction sheet 40 for use on the front of the master sheet 31 to correct the original thereof is coated on its surface facing the master sheet with a pressure-transferable pigmented coating. For use in correcting an error on the original made by an inked fabric ribbon, the coating may consist of a mixture of titanium-dioxide and magnesium-silicate pigments in a polyvinyl-chloride-polyvinyl-acetate polymer-resin binder. For correcting the original or front surface of a master sheet 31 typed with a carbon-formula ribbon, the transferable coating may be a mixture of polyvinyl-chloridepolyvinyl-acetate copolymer resin and 3-8% by weight resin, together with a mixture of titanium-dioxide and magnesium-silicate pigments.
The correction sheet 38 for correcting the hectographic master on the rear or inner surface of the master sheet 31 is formed from a lacquer comprising of about 50- 60% solids and 40-50% volatile solvents, by weight. In practice, a satisfactory mixture has been 58.1% solids and 41.9% volatile solvents, by weight. The solids consist of about 89-96% pigments, 13% polyvinyl-chloridepolyvinyl-acetate copolymer, and about 110% gilsonite, all by weight. A preferred formulation of the solids is 96 parts pigment to 4 parts binder. The pigments include 75 parts titanium dioxide, 24.5 parts magnesium silicate and 0.5 part graphite. The binder is a mixture of 3 parts polyvinyl-chloridepolyvinyl-acetate copolymer and 1 part gilsonite. The solvent portion is a mixture of solvents such as methyl ethyl ketone and toluene in approximately equal amounts. The inclusion of gilsonite has been found remarkably advantageous in covering and sealing the corrected hectograph-dye or -material error area.
The above has discussed the correction of a typed error. However, the above correction-material coatings may be employed to correct other than typed errors, such as line drawings, etc. For this purpose, the corresponding correction material in liquid form may be brushed over the hectographic-dye impression and over the front or original side of the master sheet. Upon drying, the error is covered, and the master may be finished.
Of course, if paper of color other than white is used, suitable dyes may be incorporated in the correction coating to match the paper color.
It is within the scope of this invention to introduce the unit 30 with its closed end foremost into the typewriter.
From the foregoing, it is seen that the present invention provides a unique method of error correction in hectographic procedures, and articles and compositions for use therein, which fully accomplish their intended objects and are well adapted to meet practical conditions of manufacture and use.
Although the present invention has been described in some detail by way of illustration and example for purposes of clarity of understanding, it is understood that certain changes and modifications may be made within the spirit of the invention and scope of the appended claims.
What is claimed is:
1. A method of correcting a mistyped hectographic master sheet and copy sheet being typed with a hectographic and carbon-coated intermediate sheet comprising the steps of providing a first correction sheet having a pressure transferable pigmented coating on one face, placing said first correction sheet in front of said master sheet with said coating adjacent to said master sheet, providing a second correction sheet having a pressure transferable lacquer comprised of 8996% pigment and 114% binder, said pigment containing 75 parts of titanium dioxide, 245 parts of magnesium silicate and 0.5 part of graphite on one face, placing said second correction sheet between said master and intermediate sheets with said lacquer adjacent to said master sheet, providing a third correction sheet having a pressure tranferable pigmented coating on one face, placing said third correction sheet between said intermediate and copy sheets with its pigmented coating adjacent to said copy sheet, retyping the error to transfer said coatings and lacquer to said master and copy sheets, removing said correction sheets, then inserting a patch having a hectographic coating against said intermediate sheet with said hectographic coating facing said master sheet, and thereafter typing on the master sheet.
2. A method according to claim 1, wherein said binder comprises about 13% by weight polyvinyl chloridepolyvinyl acetate co-polymer, and about 1-10% by weight of gilsonite.
References Cited UNITED STATES PATENTS 2,386,872 10/1945 Lewis 101-473 2,582,932 1/1952 Lustbader 101-473 2,767,650 10/1956 Yunker et al. 197-181XR 3,128,564 4/1964 Atherton 101-473 XR 3,155,216 11/1964 Talmadge 197-181 DAVID KLEIN, Primary Examiner U.S. Cl. X.R.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650794A (en) * 1970-06-19 1972-03-21 Richard L Steinbach Correction accessory for hectographic stencils
US3664869A (en) * 1968-01-24 1972-05-23 Sergio Sala Typewriter ribbons having correction coating and method of making
US3850656A (en) * 1970-07-13 1974-11-26 W Brown Typing error correction system
US3852089A (en) * 1972-04-05 1974-12-03 S Giaccone Method for correcting mistyped business forms
US3942621A (en) * 1970-04-28 1976-03-09 Mac Karlan Method of and article for masking
US4055704A (en) * 1975-08-01 1977-10-25 John Fahimian Typing correction paper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386872A (en) * 1941-07-02 1945-10-16 Gen Manifold & Printing Co Duplicating pad or sales book
US2582932A (en) * 1946-04-05 1952-01-15 Autographic Register Co Hectograph master sheet
US2767650A (en) * 1953-07-24 1956-10-23 Ellen M Yunker Article for correcting master sheets
US3128564A (en) * 1962-07-10 1964-04-14 Thomas C Rousseau Method of making up a test and providing a key therefor
US3155216A (en) * 1962-03-26 1964-11-03 Calvin C Talmage Type-effacing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386872A (en) * 1941-07-02 1945-10-16 Gen Manifold & Printing Co Duplicating pad or sales book
US2582932A (en) * 1946-04-05 1952-01-15 Autographic Register Co Hectograph master sheet
US2767650A (en) * 1953-07-24 1956-10-23 Ellen M Yunker Article for correcting master sheets
US3155216A (en) * 1962-03-26 1964-11-03 Calvin C Talmage Type-effacing device
US3128564A (en) * 1962-07-10 1964-04-14 Thomas C Rousseau Method of making up a test and providing a key therefor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664869A (en) * 1968-01-24 1972-05-23 Sergio Sala Typewriter ribbons having correction coating and method of making
US3942621A (en) * 1970-04-28 1976-03-09 Mac Karlan Method of and article for masking
US3650794A (en) * 1970-06-19 1972-03-21 Richard L Steinbach Correction accessory for hectographic stencils
US3850656A (en) * 1970-07-13 1974-11-26 W Brown Typing error correction system
US3852089A (en) * 1972-04-05 1974-12-03 S Giaccone Method for correcting mistyped business forms
US4055704A (en) * 1975-08-01 1977-10-25 John Fahimian Typing correction paper

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