US2124159A - Method of increasing the brilliancy of photographic pictures, and composition therefor - Google Patents
Method of increasing the brilliancy of photographic pictures, and composition therefor Download PDFInfo
- Publication number
- US2124159A US2124159A US726185A US72618534A US2124159A US 2124159 A US2124159 A US 2124159A US 726185 A US726185 A US 726185A US 72618534 A US72618534 A US 72618534A US 2124159 A US2124159 A US 2124159A
- Authority
- US
- United States
- Prior art keywords
- silver
- brilliancy
- acid
- thiosulfate
- fixing
- 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
- 238000000034 method Methods 0.000 title description 11
- 239000000203 mixture Substances 0.000 title description 3
- 229910052709 silver Inorganic materials 0.000 description 20
- 239000004332 silver Substances 0.000 description 20
- 150000001875 compounds Chemical class 0.000 description 17
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 15
- 229940048910 thiosulfate Drugs 0.000 description 15
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 14
- 239000000126 substance Substances 0.000 description 13
- -1 thiosinamine Chemical class 0.000 description 12
- 239000002253 acid Substances 0.000 description 10
- 239000000839 emulsion Substances 0.000 description 10
- IYYZUPMFVPLQIF-UHFFFAOYSA-N dibenzothiophene Chemical compound C1=CC=C2C3=CC=CC=C3SC2=C1 IYYZUPMFVPLQIF-UHFFFAOYSA-N 0.000 description 8
- 229910021607 Silver chloride Inorganic materials 0.000 description 5
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 5
- IBHOXPYFBZYILI-UHFFFAOYSA-N (2,3-dinitrophenyl) thiocyanate Chemical compound [O-][N+](=O)C1=CC=CC(SC#N)=C1[N+]([O-])=O IBHOXPYFBZYILI-UHFFFAOYSA-N 0.000 description 4
- QIOZLISABUUKJY-UHFFFAOYSA-N Thiobenzamide Chemical compound NC(=S)C1=CC=CC=C1 QIOZLISABUUKJY-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- BDSYEKLSEKMQDH-UHFFFAOYSA-N ethyl(phenyl)carbamodithioic acid Chemical compound CCN(C(S)=S)C1=CC=CC=C1 BDSYEKLSEKMQDH-UHFFFAOYSA-N 0.000 description 4
- MWCGLTCRJJFXKR-UHFFFAOYSA-N n-phenylethanethioamide Chemical compound CC(=S)NC1=CC=CC=C1 MWCGLTCRJJFXKR-UHFFFAOYSA-N 0.000 description 4
- WXNKKAIEQXMTBZ-UHFFFAOYSA-N o-ethyl n-phenylcarbamothioate Chemical compound CCOC(=S)NC1=CC=CC=C1 WXNKKAIEQXMTBZ-UHFFFAOYSA-N 0.000 description 4
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 4
- OEQKDMLGGWPHQT-UHFFFAOYSA-N 2-chloro-4-ethylsulfanylbenzoic acid Chemical compound CCSC1=CC=C(C(O)=O)C(Cl)=C1 OEQKDMLGGWPHQT-UHFFFAOYSA-N 0.000 description 3
- ICNFHJVPAJKPHW-UHFFFAOYSA-N 4,4'-Thiodianiline Chemical compound C1=CC(N)=CC=C1SC1=CC=C(N)C=C1 ICNFHJVPAJKPHW-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 3
- 229910052946 acanthite Inorganic materials 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- RWPGFSMJFRPDDP-UHFFFAOYSA-L potassium metabisulfite Chemical compound [K+].[K+].[O-]S(=O)S([O-])(=O)=O RWPGFSMJFRPDDP-UHFFFAOYSA-L 0.000 description 2
- 229940043349 potassium metabisulfite Drugs 0.000 description 2
- 235000010263 potassium metabisulphite Nutrition 0.000 description 2
- 150000003378 silver Chemical class 0.000 description 2
- XUARKZBEFFVFRG-UHFFFAOYSA-N silver sulfide Chemical compound [S-2].[Ag+].[Ag+] XUARKZBEFFVFRG-UHFFFAOYSA-N 0.000 description 2
- 229940056910 silver sulfide Drugs 0.000 description 2
- 229940001474 sodium thiosulfate Drugs 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 150000003464 sulfur compounds Chemical class 0.000 description 2
- OTNSJAUBOYWVEB-UHFFFAOYSA-N 1,2,4-thiadiazolidine-3,5-dithione Chemical compound S=C1NSC(=S)N1 OTNSJAUBOYWVEB-UHFFFAOYSA-N 0.000 description 1
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 1
- RVBUGGBMJDPOST-UHFFFAOYSA-N 2-thiobarbituric acid Chemical compound O=C1CC(=O)NC(=S)N1 RVBUGGBMJDPOST-UHFFFAOYSA-N 0.000 description 1
- KOYJWFGMEBETBU-UHFFFAOYSA-N 6-ethoxy-1,3-benzothiazol-2-amine Chemical compound CCOC1=CC=C2N=C(N)SC2=C1 KOYJWFGMEBETBU-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 241001479434 Agfa Species 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- LEVWYRKDKASIDU-IMJSIDKUSA-N L-cystine Chemical compound [O-]C(=O)[C@@H]([NH3+])CSSC[C@H]([NH3+])C([O-])=O LEVWYRKDKASIDU-IMJSIDKUSA-N 0.000 description 1
- DBTDEFJAFBUGPP-UHFFFAOYSA-N Methanethial Chemical compound S=C DBTDEFJAFBUGPP-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 239000004133 Sodium thiosulphate Substances 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- HTKFORQRBXIQHD-UHFFFAOYSA-N allylthiourea Chemical compound NC(=S)NCC=C HTKFORQRBXIQHD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229960003067 cystine Drugs 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- OKGXJRGLYVRVNE-UHFFFAOYSA-N diaminomethylidenethiourea Chemical compound NC(N)=NC(N)=S OKGXJRGLYVRVNE-UHFFFAOYSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- BRWIZMBXBAOCCF-UHFFFAOYSA-N hydrazinecarbothioamide Chemical compound NNC(N)=S BRWIZMBXBAOCCF-UHFFFAOYSA-N 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000003342 selenium Chemical class 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 150000003346 selenoethers Chemical class 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/38—Fixing; Developing-fixing; Hardening-fixing
Definitions
- My present invention relates to increasing the brilliancy of photographic pictures.
- One of its objects is a process of increasing the brilliancy of photographic pictures which comprises fixing the pictures in the presence of a non-toning substance capable of forming a silver salt which by reaction with sodium thio sulfate forms a soluble complex compound more slowly and with more difficulty than does silver chloride.
- Another object is a fixing composition containing such a substance. Further objects will be seen from the detailed specification following hereinafter.
- an increased brilliancy of photographic pictures may advantageously be attained by taking care that non-toning substances that is to say substances which do not react with the silver of the produced picture are present during the fixing process, which form difficultly soluble silver salts and are transformed only very slowly into soluble complex compounds with the aid of thiosulfate, that is to say which more difilcultly form a soluble complex compound with sodium thiosuliate than silver chloride. or silver bromide.
- the substances which enter into consideration behave in the fixing bath in the same manner as behaves a small quantity or iodine which yields with silver and thiosulfate more diiiicultly soluble complex compounds than the chloride or bromide. Probably the difiicultly soluble complex compounds form a protective layer around the sliver particles and thus protect them against the slight dissolving property of the fixing bath and against aggregation.
- an intensifying of the silver pictures does not occur, the tone of the picture is influenced only to such an extent as is possible by physical change of the grain. Since the said additional substances, in contrast with most of the toning or intensifying substances, have no tendency of forming strongly colored compounds (sulfide, selenide) with silver halide or of reducing silver halide to form metallic silver, fogging of the white portions cannot occur nor can it occur when varying within wide limits the concentration of the addition or other conditions of working.
- thioaniline 2.2'- diaminodiphenyl disulfide, mercaptobenzthiazole, dithiocarbanilic acid, dithioaldehyde thiocyanate, phenylthiourethane, guanylthiourea, thiohydantoine, thiobenzamide, thioacetanilide, thioformaldehyde, dinitrophenylthiocyanate, ethyl-phenyl-dithiocarbamic acid, diphenylene sulfide, 5.6.7-trichloro-3-oxythionaphthene, 1-amino-i-methylaminothiosulfonic acid, triphenylthiodicyanogen-diamidine, N-phenyl-S- cresyldithiourethane, tetzamethylthiuramtetrasulfide, thiobarbituric acid, tetranitrodipheny
- theeilect When employing organic sulfur compounds, theeilect consists in forming a dimcultly soluble silver salt. A formation of silver sulfide is not eflfected, since these substances are not capable of forming silver sulfide under the prevailing conditions of working.
- Example 1 To a fixing bath containing 200 grams of sodium thiosulfate and 20 grams of potassium metabisulfite in one liter there are added 2 grams of lysalbinic acid.
- the photographic pictures with the aid of such a fixing bath are distinguished by an increased brilliancy.
- Example 2 To the above specified fixing bath there is added 0.1 gram of 2.2'-diaminodiphenyldisulfide.
- Example 30.1 gram of 4-ethylthiochlorobenzoic acid is added t 1 liter of one of the known developers for photographic papers.
- a 'method of increasing the brilliancy of photographic silver pictures which comprises exposing a silver halide emulsion, developing the latent image produced by exposure, and fixing said developed picture in a fixing bath containing mainly thiosulfate and a relatively small amount of a compound selected from the group consisting of 4-ethyl-thiochlorobenzoic acid, 4.4-diaminothiodiphenyl-S-sulfonic acid, thioaniline, 2.2-diamino-diphenyl-disulfide, dithiocarbanilic acid, phenylthiourethane, thiobenzamide, thioacetanilide, dinitrophenylthiocyanate, ethyl-phenyl-dithiocarbamic acid, diphenylene sulfide, triphenylthiodicyanogen-diamidine.
- N-phenyl-S-cresyldithiourethane and tetranitrodiphenyldisulfide said compounds being capable of forming with a complex compound which is formed by thiosulfate and the small quantity of silver dissolved by the thiosulfate of the fixing bath, a colorless to weakly yellow precipitate which is less soluble in an excess of thiosulfate than is silver chloride and silver bromide.
- a method of increasing the brilliancy. of photographic silver pictures which comprises exposing a silver halide emulsion, developing the latent image produced by exposure and fixing said developed picture in an aqueous thiosulfate solution containing per liter 0.1 gram of 2.2-diaminodiphenyl-disulfide.
- a method of increasing the brilliancy of photographic silver pictures which comprises exposing a silver halide emulsion, developing the latent image produced by exposure in a developing bath containing per liter of developer 0.1 gram of 4-ethylthiochlorobenzoic acid, and fixing the image by treatment with a fixing bath containing sodium thiosulfate.
- a photographic treating bath which comprises an aqueous solution containing mainly thiosulfate and a relatively small amount 01 a compound selected from the group consisting of 4-ethyl-thiochlorobenzoic acid, 4.4-diamino-thiodiphenyl-B-sulfonic acid, thoianiline, 2.2'-dlamino-diphenyl-disulfide, dithiocarbanilic a 01 d, phenylthiourethane, thiobenzamide, thioacetanilide, dinitrophenylthiocyanate, ethyl-phenyl-dithiocarbamic acid, diphenylene sulfide, triphenylthiodicyanogendiamidine, N-phenyl-S-cresyldithiourethane and tetranitrodiphenyl-disulfide.
- said compounds being capable of forming with a complex compound which is formed by thiosulfate and the small quantity of silver dissolved by the thiosulfate of the fixing bath, a colorless to weakly yellow precipitate which is less soluble in an excess of thiosulfate than is silver chloride and silver bromide.
- composition-for fixing developed photographic silver images which comprises a solution of 780 grams of water, 200 grams of sodium thiosulphate, 20 grams of potassium metabisulfite, and 0.1 gram of 2.2-diamino-diphenyldisulfide.
- a method of increasing the brilliancy of photographic silver pictures which comprises exposing a silver halide emulsion, developing said exposed material in an aqueous solution of mainly developing agent and a relatively small amount of an organic compound having in its molecule a divalent sulfur atom and being a member of the group consisting of 4-ethyl-thiochlorobenzoic acid, 4.4-diamino-thiodiphenyl-5-sulfonic acid, thioaniline, 2.2-diamino-diphenyl-disulfide, dithiocarbanilic acid, phenylthiourethane, thiobenzamide, thioacetanilide, dinitrophenylthiocyanate, ethyl-phenyl-dithiocarbamic acid, diphenylene sulfide, trlphenyl-thiodicyanogen-diamidine, N-phenyl-S-cresyldithiourethan
- a composition for developing photographic silver images which comprises an aqueous solution of a developing agent and 0.1 gram of 4- ethyl-thiochlorobenzoic acid per liter of developer.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI0047278 | 1933-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2124159A true US2124159A (en) | 1938-07-19 |
Family
ID=7191958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US726185A Expired - Lifetime US2124159A (en) | 1933-05-24 | 1934-05-17 | Method of increasing the brilliancy of photographic pictures, and composition therefor |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2124159A (en)) |
| BE (1) | BE403307A (en)) |
| FR (1) | FR773354A (en)) |
| GB (1) | GB421636A (en)) |
| NL (1) | NL55621C (en)) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2423767A (en) * | 1944-02-03 | 1947-07-08 | Ilford Ltd | Tone-control agents for silver halide emulsions |
| US2432506A (en) * | 1943-11-26 | 1947-12-16 | Ilford Ltd | Treatment of developed silver images with mercapto-tetrazole and triazole compounds |
| US2453087A (en) * | 1946-11-07 | 1948-11-02 | Gen Aniline & Film Corp | Photographic developers containing tetrazolyl disulfides as antifogging agents |
| US2461987A (en) * | 1946-06-20 | 1949-02-15 | Eastman Kodak Co | Antiplumming agents for photographic emulsions |
| US2465149A (en) * | 1946-04-25 | 1949-03-22 | Gen Aniline & Film Corp | Tetrazolyl disulfides as stabilizing agents for silver-halide emulsions |
| US2512721A (en) * | 1946-08-20 | 1950-06-27 | Ilford Ltd | Silver halide photographic emulsions containing a blue black toner |
| US2514650A (en) * | 1946-04-05 | 1950-07-11 | Eastman Kodak Co | Photographic developing with addition products to improve image quality |
| US2756145A (en) * | 1953-12-31 | 1956-07-24 | Eastman Kodak Co | Silver halide emulsions containing a diamino diphenyl amine stabilizer |
| US3201243A (en) * | 1962-10-18 | 1965-08-17 | Eastman Kodak Co | Method of inhibiting discoloration of color photographic layers containing dye images and resulting photographic products |
-
0
- BE BE403307D patent/BE403307A/xx unknown
- NL NL55621D patent/NL55621C/xx active
-
1934
- 1934-05-15 GB GB14656/34A patent/GB421636A/en not_active Expired
- 1934-05-16 FR FR773354D patent/FR773354A/fr not_active Expired
- 1934-05-17 US US726185A patent/US2124159A/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2432506A (en) * | 1943-11-26 | 1947-12-16 | Ilford Ltd | Treatment of developed silver images with mercapto-tetrazole and triazole compounds |
| US2423767A (en) * | 1944-02-03 | 1947-07-08 | Ilford Ltd | Tone-control agents for silver halide emulsions |
| US2514650A (en) * | 1946-04-05 | 1950-07-11 | Eastman Kodak Co | Photographic developing with addition products to improve image quality |
| US2465149A (en) * | 1946-04-25 | 1949-03-22 | Gen Aniline & Film Corp | Tetrazolyl disulfides as stabilizing agents for silver-halide emulsions |
| US2461987A (en) * | 1946-06-20 | 1949-02-15 | Eastman Kodak Co | Antiplumming agents for photographic emulsions |
| US2512721A (en) * | 1946-08-20 | 1950-06-27 | Ilford Ltd | Silver halide photographic emulsions containing a blue black toner |
| US2453087A (en) * | 1946-11-07 | 1948-11-02 | Gen Aniline & Film Corp | Photographic developers containing tetrazolyl disulfides as antifogging agents |
| US2756145A (en) * | 1953-12-31 | 1956-07-24 | Eastman Kodak Co | Silver halide emulsions containing a diamino diphenyl amine stabilizer |
| US3201243A (en) * | 1962-10-18 | 1965-08-17 | Eastman Kodak Co | Method of inhibiting discoloration of color photographic layers containing dye images and resulting photographic products |
Also Published As
| Publication number | Publication date |
|---|---|
| NL55621C (en)) | |
| GB421636A (en) | 1934-12-27 |
| FR773354A (fr) | 1934-11-16 |
| BE403307A (en)) |
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