US1519975A - Production of stencils for use in duplicating manuscript and typewritten documents, drawings, and the like - Google Patents
Production of stencils for use in duplicating manuscript and typewritten documents, drawings, and the like Download PDFInfo
- Publication number
- US1519975A US1519975A US676178A US67617823A US1519975A US 1519975 A US1519975 A US 1519975A US 676178 A US676178 A US 676178A US 67617823 A US67617823 A US 67617823A US 1519975 A US1519975 A US 1519975A
- Authority
- US
- United States
- Prior art keywords
- stencils
- colloid
- drawings
- porous support
- documents
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 5
- 239000000084 colloidal system Substances 0.000 description 30
- 239000003795 chemical substances by application Substances 0.000 description 19
- 238000005496 tempering Methods 0.000 description 19
- 239000000203 mixture Substances 0.000 description 18
- 239000008199 coating composition Substances 0.000 description 11
- 239000006185 dispersion Substances 0.000 description 11
- 239000002609 medium Substances 0.000 description 10
- 108090000623 proteins and genes Proteins 0.000 description 8
- 102000004169 proteins and genes Human genes 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 239000000499 gel Substances 0.000 description 6
- 230000001427 coherent effect Effects 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000011147 inorganic material Substances 0.000 description 3
- 241000206575 Chondrus crispus Species 0.000 description 2
- 241000206672 Gelidium Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002612 dispersion medium Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UBLAMKHIFZBBSS-UHFFFAOYSA-N 3-Methylbutyl pentanoate Chemical compound CCCCC(=O)OCCC(C)C UBLAMKHIFZBBSS-UHFFFAOYSA-N 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- 241001474374 Blennius Species 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 241001310324 Cetraria islandica Species 0.000 description 1
- 239000001828 Gelatine Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 235000010419 agar Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- -1 dispersators Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 108010059642 isinglass Proteins 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 229910052627 muscovite Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000035900 sweating Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/24—Stencils; Stencil materials; Carriers therefor
- B41N1/243—Stencils; Stencil materials; Carriers therefor characterised by the ink pervious sheet, e.g. yoshino paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S106/00—Compositions: coating or plastic
- Y10S106/04—Bentonite
Definitions
- This invention relates to the production of stencils for use in duplicating manuscript and typewritten documents, drawings and the like, and particularly to the type of stencil in which a porous support, such as yoshino paper, is provided with a stencil layer including on organic colloid, for instance a coagulated protein, which does not needmoistening in order to soften the coating composition prior to cutting the stencil.
- a porous support such as yoshino paper
- a stencil layer including on organic colloid for instance a coagulated protein, which does not needmoistening in order to soften the coating composition prior to cutting the stencil.
- tempering agents has therefore been limited to such as when dissolved in suitable organic solvents can be .vention the desired degree of dispersion of incorporated in the composition used for coating or can be emulsified and in the form of emulsions mixed with the solution of the main colloid constituentof the coating composition;
- the present invention is base upon the observation that tempering agents which are not soluble in or emulsifiable with a solution? of the colloid or in the medium in which the colloid is dispersed can by mechanical means he brought to the desired degree of dispersion through the coating composition.
- the organic colloid disperse and the tempering agent may be passed together between surfaces spaced apart about 0.007 of an inch and moving relatively to one another at 'the rate of -17,000 to 18,000 feet per minute.
- a device comprising discs, the,faces of which are spaced 0.007 inches apart, fourteen inches in diameter and rotated relativel to one. another at a speed of 5,000 revo utions per minute, may be employed.
- the immediateefi'ectto be secured is similar to that secured in homogenizing milk, the ultimate result being similar also.
- the tempering agent may be secured purely by mechanical means or mechanical treatment and the employment of stablizing agents, dispersators ,and emulsifying agents entirely dispensed with, such aids to securing the desired degree of dispersion o; the-tempering agents maybe made use 0 Y
- pigments or other solids may be employed as ancillary dispersion means 'or stablizers.
- Inorganic materials capable of forming with the dispersion medium for the colloid, colloidsols or colloidal solutions or absorbing many times their weight ofthe disperse medium forming gels may conveniently be employed and as examples of such materials hi hly colloidal clays may be specified.
- Suc materials of the. char- I appear to be most suitable when, for instance, the disperse medium is water.
- This material dried at 110 0., has the following chemical composition Silica (SiO 57.98% Ferrous oxide (Fe'O) 0.12% Ferric oxide (Fe, O 3.80% Alumina (A1 0 22.46% Lime (CaO) 1.92% Magnesia (MgO) 3.24% Soda and potash Na O and K. ,O) 1.35% Sulphur trioxide (S0 0.75%
- the state of division of the material is indicated by the fact that 73.82% of the product as marketed is represented by particles less than 0.0015 mm. in diameter.
- tempering agent sweating out of the coating composition may assist in securing or maintaining the tempering agent in the desired degree of dispersion, but it wouldappear that their main function is to prevent the tempering agent sweating out of the coating composition.
- a suitable composition the following may be given -150 parts by weight of a 10% solution of gelatine;
- Yoshino paper is coated with the composition in the usual manner and, after drying, the coated sheet may be treated with formaldehyde Vapour'if a coagulable protein constitutes the gelatinizing organic colloid in the composition.
- seaweed jellies such as agar-agar, carragheen moss, Irish moss, Iceland moss, Japanese isinglass or the like colloidal materials are employed, treatment by weight of mineral oil of s. g.
- a porous support such asv yoshino paper
- a stencil layer including a gelatinized organic colloid, for instance a coagulated protein which does not need moistening in order to soften the coating composition prior to cutting the stencil, which comprises effecting by mechanical means the dispersion in the coating composition to the desired degree of tempering agents which are not soluble in the medium in which the colloid is dispersed and applying said composition to a porous support.
- the process of producing stenclls for' paper is provided with a stencil layer including a gelatinized organic colloid, for instance a coagulated protein, which does not need moistening in order to soften the coating composition rior to cutting the stencil, which comprlses bringing a disperse system includlng' an organic colloid capable of forming a coherent gel together with a tempering agent insoluble in the medium in which the organic colloid is dispersed and an inorganic material canable of forming with the dispersion medium for the colloid colloid sols, subjecting the mixture to purely mechanical treatment to bring the tempering agent to the desired degree of dispersion through the organic colloid disperse, and applying said composition to a porous support.
- a gelatinized organic colloid for instance a coagulated protein
- a porous support such as yoshino paper
- a stencil layer including a gelatinized organic colloid, for instance a coagulated protein, which does not need moistening in order to soften the coating composition prior to cutting the stencil, which comprlses bringing a dis perse system including an organic colloid capable of forming a coherent gel together with a tempering agent insoluble in the medium inwhich the organic colloid is dispersed and an inorganic material capable of absorbing vmany times its weight of the disperse medium forming gels, subjecting the mixture to purely mechanical treatment to bring the tempering agent to the desired degree of dispersion through the organic colloid disperse, and applying said composition to a porous support.
- a gelatinized organic colloid for instance a coagulated protein
Description
Patented Dec. 16, 1924.
PATENT OFFICE.
ABKAND :Dll WAELE, OF LONDON, ENGLAND, ASSIGNOB TO D. GISTETNER, LIMITED,
01 LONDON,
PRODUCTION OI STENOILS FOR USE IN DUPLICATING MANUSCRIPT AND TYPE- WRIT'IEN DOCUMENTS, DRAWINGS, AND LIKE.
Ho Drawing.
To all whom it may-concern:
Be it known that I, ARMAND nnWAELn, a subject of the King of Great Britain and Ireland, and residing at 29 Belmont Ave- 5 nue, Palmers- Green, London, N. 13, England, have invented certain new and useful improvements in and relating to the production of stencils for use in duplicating manuscript and typewritten documents, drawings, and the like, of which the following 1s a specification.
This invention relates to the production of stencils for use in duplicating manuscript and typewritten documents, drawings and the like, and particularly to the type of stencil in which a porous support, such as yoshino paper, is provided with a stencil layer including on organic colloid, for instance a coagulated protein, which does not needmoistening in order to soften the coating composition prior to cutting the stencil. p a
Certain difficulties arise in the production of stencils of this kind, the main difficnlty being due to the fact that comparatively few tempering agents, the pres ence of which in the stencil layer is, generally speaking, (if not invariably) necessary, have hitherto been able to be brought into sufliciently intimate association with the colloid.
The choice of the tempering agents has therefore been limited to such as when dissolved in suitable organic solvents can be .vention the desired degree of dispersion of incorporated in the composition used for coating or can be emulsified and in the form of emulsions mixed with the solution of the main colloid constituentof the coating composition;
In some cases, however, it has been proposed to convert the tempering a cut into a water-soluble or water-emulsifiab e derivative which can be mixed with the solution of the colloid and optionally be subsequently decomposed as, for instance, in the operation of coagulating the rotein.
The present invention is base upon the observation that tempering agents which are not soluble in or emulsifiable with a solution? of the colloid or in the medium in which the colloid is dispersed can by mechanical means he brought to the desired degree of dispersion through the coating composition.
Application filed November 21, 1923. Serial No. 676,178.
that which is regarded as characteristic of the division of the disperse phase in colloidal solutions.
As indicative of the treatment necessary, it vmay be remarked that the organic colloid disperse and the tempering agent may be passed together between surfaces spaced apart about 0.007 of an inch and moving relatively to one another at 'the rate of -17,000 to 18,000 feet per minute.
Thus, in order to secure the desired degree of dispersion a device comprising discs, the,faces of which are spaced 0.007 inches apart, fourteen inches in diameter and rotated relativel to one. another at a speed of 5,000 revo utions per minute, may be employed.
The immediateefi'ectto be secured is similar to that secured in homogenizing milk, the ultimate result being similar also.
While in accordance with they present inthe tempering agent may be secured purely by mechanical means or mechanical treatment and the employment of stablizing agents, dispersators ,and emulsifying agents entirely dispensed with, such aids to securing the desired degree of dispersion o; the-tempering agents maybe made use 0 Y Thus, for instance, pigments or other solids may be employed as ancillary dispersion means 'or stablizers.
Inorganic materials capable of forming with the dispersion medium for the colloid, colloidsols or colloidal solutions or absorbing many times their weight ofthe disperse medium forming gels, may conveniently be employed and as examples of such materials hi hly colloidal clays may be specified. Suc materials of the. char- I appear to be most suitable when, for instance, the disperse medium is water.
The material known as bentonite, de-
posits of which occur in the State of \Vyom-v ing, United States of' America, ancLin Alberta, Canada, is an example.
This material, dried at 110 0., has the following chemical composition Silica (SiO 57.98% Ferrous oxide (Fe'O) 0.12% Ferric oxide (Fe, O 3.80% Alumina (A1 0 22.46% Lime (CaO) 1.92% Magnesia (MgO) 3.24% Soda and potash Na O and K. ,O) 1.35% Sulphur trioxide (S0 0.75%
Loss on ignition (H 0, 00 Org)- 7.93%
The state of division of the material is indicated by the fact that 73.82% of the product as marketed is represented by particles less than 0.0015 mm. in diameter.
The addition of such materials may assist in securing or maintaining the tempering agent in the desired degree of dispersion, but it wouldappear that their main function is to prevent the tempering agent sweating out of the coating composition.
As an example of a suitable composition, the following may be given -150 parts by weight of a 10% solution of gelatine;
100 parts 0.85-0.90.
Tothe mixture 5 parts of bentonite previously allowed to swell or gelatinize in at least 50 parts by weight of water may be added.
Yoshino paperis coated with the composition in the usual manner and, after drying, the coated sheet may be treated with formaldehyde Vapour'if a coagulable protein constitutes the gelatinizing organic colloid in the composition.
When, however, seaweed jellies, such as agar-agar, carragheen moss, Irish moss, Iceland moss, Japanese isinglass or the like colloidal materials are employed, treatment by weight of mineral oil of s. g.
with formaldehyde vapour may be omitted.-
Claims use in duplicating manuscript and typewritten documents, drawings and the like, and particularly stencils of the kind in which a porous support, such asv yoshino paper, is provided with a stencil layer including a gelatinized organic colloid, for instance a coagulated protein, which does not need moistening in order to soften the coating composition prior to cutting the stencil, which comprises effecting by mechanical means the dispersion in the coating composition to the desired degree of tempering agents which are not soluble in the medium in which the colloid is dispersed and applying said composition to a porous support.
2. The process of producing stencils for use in duplicating manuscript and typewrit ten documents, drawings andthe like, and
'particularly stencils of the kind in which a porous support, such as yoshino paper, is
.jecting the mixture to purely mechanical treatment to bring the tempering agent to the desired degree of dispersion through the organic colloid disperse, and applying said composition to a porous support.
3. The process of producing stencils for use in duplicating manuscript and typewritten documents, drawings and the like, and particularly stencils of the kind in which a porous support, such as yoshino paper, is provided with a stencil layer including a gelatinized organic colloid, for instance a coagulated protein, which does not need moistening in order to soften the coating composition prior to cutting the stencil, which comprises bringing a disperse system including an organic colloid capable of forming a coherent gel to other with a tempering agent insoluble in t e medium in which the organic colloid is dispersed, sub jecting the mixture to purely mechanical treatment of a character to secure that the degree of dispersion ofthe tempering agent in the composition used in .formin the stencil layer is substantially that whlch isregarded as characteristic of the division of the disperse phase in colloidal solutions, and applying said composition to a porous support.
4. The process of producing stencils for use in duplicating manuscript and typewritten. documents, drawings and the like, and particularly stencils of the kind in .which a porous support, such as yoshino 1. The process of producing stenclls for' paper, is provided with a stencil layer including a gelatinized organic colloid, for instance a coagulated protein, which does not need moistening in order to soften the coating composition rior to cutting the stencil, which comprlses bringing a disperse system includlng' an organic colloid capable of forming a coherent gel together with a tempering agent insoluble in the medium in which the organic colloid is dispersed and an inorganic material canable of forming with the dispersion medium for the colloid colloid sols, subjecting the mixture to purely mechanical treatment to bring the tempering agent to the desired degree of dispersion through the organic colloid disperse, and applying said composition to a porous support.
5. The process of producing stencils for use in duplicating manuscript and typewritten documents, drawings and the like, and particularly stencils of the kind in which. a porous support, such as yoshino paper, is provided wlth a stencil layer including a gelatinized organic colloid, for instance a coagulated protein, which does not need moistening in order to soften the coating composition prior to cutting the stencil, which comprlses bringing a dis perse system including an organic colloid capable of forming a coherent gel together with a tempering agent insoluble in the medium inwhich the organic colloid is dispersed and an inorganic material capable of absorbing vmany times its weight of the disperse medium forming gels, subjecting the mixture to purely mechanical treatment to bring the tempering agent to the desired degree of dispersion through the organic colloid disperse, and applying said composition to a porous support.
6. The process of producing stencils for use in duplicating manuscript and typewritten documents, drawings and the like, and particularly stencils of the kind in which a porous support, such as yoshino paper, is provided with a stencil layer including a gelatinized organic COllOld, for instance a coagulated protein, which does not need moistening in order to soften the coating composition prior to cutting the stencil, which comprises bringing a disperse system including an organic colloid capable of forming a coherent el together with a tempering agent insolu le in the medium in which the organic colloid is dispersed and highly colloidal clays, and applying said composition to a porous support.
7. The process of producing stencils for use in duplicating manuscript and typewritten documents, drawings and the like, and particularly stencils of the kind in which a porous support, such as yoshino paper, is provided with stencil layer including a gelatinized organic colloid, for instance a coagulated protein, which does not need moistening in order to soften the coating composition prior to cutting the stencil, which comprises bringing a disperse system including an organic colloid capable of forming a coherent gel together with a tempering agent insoluble in the medium in which the organic colloid is dispersed and bentonite,
and applying said composition to a porous support.
In testimony whereof I have signed my name to this specification.
ARMAND DE WAELE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US676178A US1519975A (en) | 1923-10-29 | 1923-11-21 | Production of stencils for use in duplicating manuscript and typewritten documents, drawings, and the like |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2707323A GB228247A (en) | 1923-10-29 | 1923-10-29 | Improvements in and relating to the production of stencil sheets for use in duplicating manuscript and typewritten documents, drawings and the like |
| US676178A US1519975A (en) | 1923-10-29 | 1923-11-21 | Production of stencils for use in duplicating manuscript and typewritten documents, drawings, and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1519975A true US1519975A (en) | 1924-12-16 |
Family
ID=26258612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US676178A Expired - Lifetime US1519975A (en) | 1923-10-29 | 1923-11-21 | Production of stencils for use in duplicating manuscript and typewritten documents, drawings, and the like |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1519975A (en) |
-
1923
- 1923-11-21 US US676178A patent/US1519975A/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2021141A (en) | Watermarking composition | |
| US2954302A (en) | Water repellent paper and sheathing board | |
| US1519975A (en) | Production of stencils for use in duplicating manuscript and typewritten documents, drawings, and the like | |
| US1808476A (en) | Printing | |
| US2337737A (en) | Duplicating process for reproducing color designs of high color intensity | |
| US2515536A (en) | Planographic repellent solution and method of preparing the same | |
| US1101269A (en) | Process for forming stencil-sheets. | |
| US3083639A (en) | Process for making planographic printing plates | |
| US1101268A (en) | Stencil-sheet. | |
| US2122774A (en) | Stencil sheet | |
| US1604884A (en) | Duplicating | |
| US2007783A (en) | Stencil | |
| US1548315A (en) | Method of producing stencil sheets for manifolding purpose or the like | |
| AT118616B (en) | Stencil sheet. | |
| DE423041C (en) | Template sheet for duplicating documents | |
| US1863867A (en) | Paper size and process of making same | |
| US1526982A (en) | Stencil sheet | |
| GB228248A (en) | Improvements in and relating to the production of stencil-sheets for use in duplicating manuscript and typewritten documents, drawings and the like | |
| US1810484A (en) | Stencil sheet | |
| US1753205A (en) | Stencil sheet | |
| CH107879A (en) | Cliché sheet for the multiple reproduction of documents, manuscripts and typescripts, drawings, etc., and method of making the same. | |
| US1445387A (en) | Coated paper and substance for coating the same | |
| US1770697A (en) | Stencil sheet | |
| US1244188A (en) | Stencil-sheet. | |
| US1744755A (en) | Stencil sheet for use in duplicating |