US3352676A - Processing of color photographic materials - Google Patents
Processing of color photographic materials Download PDFInfo
- Publication number
- US3352676A US3352676A US317157A US31715763A US3352676A US 3352676 A US3352676 A US 3352676A US 317157 A US317157 A US 317157A US 31715763 A US31715763 A US 31715763A US 3352676 A US3352676 A US 3352676A
- Authority
- US
- United States
- Prior art keywords
- bath
- color
- iodide
- silver
- bleach
- 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
- 239000000463 material Substances 0.000 title claims description 23
- 238000012545 processing Methods 0.000 title description 6
- 229910052709 silver Inorganic materials 0.000 claims description 24
- 239000004332 silver Substances 0.000 claims description 24
- -1 SILVER HALIDE Chemical class 0.000 claims description 22
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000839 emulsion Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000007844 bleaching agent Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 13
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical class [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 13
- 238000011161 development Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000004061 bleaching Methods 0.000 description 6
- 239000000975 dye Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 235000007715 potassium iodide Nutrition 0.000 description 5
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 4
- 238000007792 addition Methods 0.000 description 4
- 229960001484 edetic acid Drugs 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 4
- 239000004133 Sodium thiosulphate Substances 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 150000004694 iodide salts Chemical class 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- WTDHULULXKLSOZ-UHFFFAOYSA-N Hydroxylamine hydrochloride Chemical compound Cl.ON WTDHULULXKLSOZ-UHFFFAOYSA-N 0.000 description 2
- 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 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical compound [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 description 2
- 229940006461 iodide ion Drugs 0.000 description 2
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 235000010265 sodium sulphite Nutrition 0.000 description 2
- XZXYQEHISUMZAT-UHFFFAOYSA-N 2-[(2-hydroxy-5-methylphenyl)methyl]-4-methylphenol Chemical compound CC1=CC=C(O)C(CC=2C(=CC=C(C)C=2)O)=C1 XZXYQEHISUMZAT-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- FCKYPQBAHLOOJQ-UHFFFAOYSA-N Cyclohexane-1,2-diaminetetraacetic acid Chemical compound OC(=O)CN(CC(O)=O)C1CCCCC1N(CC(O)=O)CC(O)=O FCKYPQBAHLOOJQ-UHFFFAOYSA-N 0.000 description 1
- XBPCUCUWBYBCDP-UHFFFAOYSA-N Dicyclohexylamine Chemical compound C1CCCCC1NC1CCCCC1 XBPCUCUWBYBCDP-UHFFFAOYSA-N 0.000 description 1
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229960000583 acetic acid Drugs 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910001516 alkali metal iodide Inorganic materials 0.000 description 1
- 229910001619 alkaline earth metal iodide Inorganic materials 0.000 description 1
- 229940107816 ammonium iodide Drugs 0.000 description 1
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 description 1
- 239000006172 buffering agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 150000004698 iron complex Chemical class 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- CMCWWLVWPDLCRM-UHFFFAOYSA-N phenidone Chemical compound N1C(=O)CCN1C1=CC=CC=C1 CMCWWLVWPDLCRM-UHFFFAOYSA-N 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 235000011008 sodium phosphates Nutrition 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 125000002813 thiocarbonyl group Chemical group *C(*)=S 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical group [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/42—Bleach-fixing or agents therefor ; Desilvering processes
- G03C7/421—Additives other than bleaching or fixing agents
Definitions
- the invention relates to a method for processing color photographic materials, and more particularly, to a method for reducing fog formation in photographic images which have been color developed and treated with a bleach-fixing bath.
- the bleaching power of such a stable bleach-fixing bath is naturally considerably less than that of a potassium ferricyanide bleaching bath; this can satisfactorily be shown by measuring its redox potential.
- the redox potential is not, however, the only factor deciding the eflicacy of the bleach-fixing bath.
- the bleaching power and the fixing power of a bleach-fixing bath can, in fact, be improved considerably by additives which do not influence the redox potential of the bath, for example, by polyethylene oxides, according to British Patent No. 746,567 or by substances containing a thiocarbonyl C S) group, according to Swiss Patent No. 336,257.
- This intermediate bath can be an aqueous solution of a water-soluble iodide which solution may be adjusted to a pH value of2 to 9.
- the solution may furthermore contain buffering agents, such as primary and secondary sodium phosphates.
- iodide ions be present in the intermediate bath.
- concentration of iodides or iodide ions can be 0.01 to 10 grams and advantageously 0.5 to 1.5 grams per liter.
- All Water-soluble iodides are suitable, more especially alkali metal iodides, such as sodium or potassium iodides, as well as ammonium iodide, alkaline earth metal iodides, or iodides of primary, secondary or tertiary amines, or of quaternary organic ammonium bases, such as methyl amine, dicyclohexylamine, pyridine, morpholine, and tetramethylammonium base.
- the bleach-fixing bath may contain as fixing agent any water-soluble thiosulphate, such as sodium and ammonium thiosulphate.
- the color photographic materials used in the present invention comprise silver halide emulsion layers which contain color couplers capable of reacting with the oxidation products of primary aromatic amino developing agents to form dyestuff images. Such materials usually contain in superirnposedrelationship three silver halide emulsion layers which are sensitized to different regions of the spectrum and which contain couplers for the production of yellow, magenta and cyan dyestuif images.
- Example A normal commercial Agfacolor reversal paper is exposed behind a stepped wedge and subjected to reversal development.
- the first development is etfected in a blackand-white developer solution containing per one liter 6 grams of hydroquinone, 0.5 gram of 1-phenyl-3-pyrazolidone, 20 grams of sodium sulfite, 50 grams of soda, and 2 grams of potassium bromide (developing time minutes); the color development, after the second exposure, is carried out for minutes with a developer solution containing per one liter 2.5 grams of N,'N-diethyl-p-phenylene diamine sulphate, 5 grams of sodium sulfite, 75 grams of potassium carbonate, 2 grams of potassium bromide, 1.5 grams of hydroxylamine hydrochloride.
- the reversal paper is now cut into 4 strips, which are further processed in different ways.
- a The first strip is treated for 3 minutes in an intermediate bath having the following composition:
- the pH is 5.2.
- the image silver is thereafter removed by a bleachfixing bath with the following composition:
- the pH is 6.2.
- a second strip is treated with an intermediate bath which differs from that used for strip A in containing no potassium iodide; the further processing takes place as with the strip A C
- the third strip, after treatment with the iodidefree intermediate bath of strip B is processed in the previously described bleach-fixing bath, which additionally contains 1 g. of potassium iodide. This procedure corresponds to that described in British Patent No. 926,- 569.
- the intermediate bath described above and having a pH of 7.0 contains also 1 gram of potassium iodide per liter; bleach-fixing bath as described above, containing no iodide.
- the fogging densities in the image whites are set out in the following table.
- the present invention is primarily concerned with such materials which are intended for reversal processes, wherein the irnagewise exposed material is given a conventional black and white development, followed by a reversal exposure, and color-forming development.
- the process of. the present invention may also be applied for the production of color images by the negative-positive process wherein the materials are color developed after imagewise exposure.
- the invention is of primary importance for the processing of multi-layer materials which have a paper support and which are intended for the production of color photographic printing especially reversal prints- What is claimed is:
- a process for the production of photographic color images which comprises the steps of 1) imagewrse exposing a photographic material comprising at least one silver halide emulsion layer which contains a color coupler capable of reacting with the oxidation product of a color-forming developer to form a dye; (2) developing the said material to form a silver and a color image, and (3) thereafter treating the said material with an aqueous bath containing botha silver halide solvent and a silver bleaching agent, the improvement which comprises subjecting the said material between said steps 2 and 3 to an aqueous solution containing iodide ions.
- a process for the production of photographic color reversal images which comprises the steps of (1) imagewise exposing a photographic material comprising at least one silver halide emulsion layer which contains a color coupler capable of reacting with the oxidation product of a color-forming .developer to form a dye; (2) developing the said material in a black and White developer solution to form at the exposed areas of said material a silver image, (3) exposing the said material, (4) developing the said material to form a silver and a dye image at the areas which are not exposed by step (1), (5) thereafter treating the said material with an aqueous bath containing both a silver halide solvent and 5 6 a silver bleaching agent, the improvement which comprises References Cited subjlecting the sfaid material lbetween said steps 4 and 5 UNITED STATES PATENTS to t e action 0 an aqueous ath containing iodide ions.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA41528A DE1164231B (de) | 1962-11-03 | 1962-11-03 | Verfahren zur Herstellung farbiger Bilder nach dem photographischen Umkehrverfahren |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3352676A true US3352676A (en) | 1967-11-14 |
Family
ID=6932585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US317157A Expired - Lifetime US3352676A (en) | 1962-11-03 | 1963-10-18 | Processing of color photographic materials |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3352676A (en)) |
| BE (1) | BE639482A (en)) |
| CH (1) | CH433983A (en)) |
| DE (1) | DE1164231B (en)) |
| GB (1) | GB990846A (en)) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3462269A (en) * | 1966-08-01 | 1969-08-19 | Minnesota Mining & Mfg | Stabilized color developing solution containing diethylenetriamine pentaacetic acid |
| US5434035A (en) * | 1993-12-29 | 1995-07-18 | Eastman Kodak Company | Fixer additives used in combination with iron complex based bleaches to improve desilvering |
| US5508150A (en) * | 1993-12-29 | 1996-04-16 | Eastman Kodak Company | Fixer additives used in combination with iron complex based bleaches to prevent iron retention |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1209050A (en) * | 1967-12-27 | 1970-10-14 | Agfa Gevaert Nv | Photographic silver halide processing liquids |
| JPS6340154A (ja) * | 1986-08-05 | 1988-02-20 | Fuji Photo Film Co Ltd | ハロゲン化銀カラ−写真感光材料の処理方法 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1482613A (en) * | 1919-10-02 | 1924-02-05 | Daylight Film Corp | Potassium iodide composition of matter for photographic processes |
| US2618559A (en) * | 1950-03-21 | 1952-11-18 | Gen Aniline & Film Corp | Stain preventing shortstop bath for photographic azine dye images |
| US2827375A (en) * | 1954-03-26 | 1958-03-18 | Gen Aniline & Film Corp | Polyamines as short stop agents for azinte color developers |
| FR1284492A (fr) * | 1960-03-23 | 1962-02-09 | Agfa Ag | Procédé de blanchiment et fixage simultanés d'images photographiques en couleur |
| US3210189A (en) * | 1961-12-20 | 1965-10-05 | Ciba Ltd | Photographic reversal process |
-
0
- BE BE639482D patent/BE639482A/xx unknown
-
1962
- 1962-11-03 DE DEA41528A patent/DE1164231B/de active Pending
-
1963
- 1963-10-18 US US317157A patent/US3352676A/en not_active Expired - Lifetime
- 1963-10-24 GB GB42058/63A patent/GB990846A/en not_active Expired
- 1963-10-28 CH CH1321563A patent/CH433983A/de unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1482613A (en) * | 1919-10-02 | 1924-02-05 | Daylight Film Corp | Potassium iodide composition of matter for photographic processes |
| US2618559A (en) * | 1950-03-21 | 1952-11-18 | Gen Aniline & Film Corp | Stain preventing shortstop bath for photographic azine dye images |
| US2827375A (en) * | 1954-03-26 | 1958-03-18 | Gen Aniline & Film Corp | Polyamines as short stop agents for azinte color developers |
| FR1284492A (fr) * | 1960-03-23 | 1962-02-09 | Agfa Ag | Procédé de blanchiment et fixage simultanés d'images photographiques en couleur |
| US3210189A (en) * | 1961-12-20 | 1965-10-05 | Ciba Ltd | Photographic reversal process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3462269A (en) * | 1966-08-01 | 1969-08-19 | Minnesota Mining & Mfg | Stabilized color developing solution containing diethylenetriamine pentaacetic acid |
| US5434035A (en) * | 1993-12-29 | 1995-07-18 | Eastman Kodak Company | Fixer additives used in combination with iron complex based bleaches to improve desilvering |
| US5508150A (en) * | 1993-12-29 | 1996-04-16 | Eastman Kodak Company | Fixer additives used in combination with iron complex based bleaches to prevent iron retention |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1164231B (de) | 1964-02-27 |
| BE639482A (en)) | |
| CH433983A (de) | 1967-04-15 |
| GB990846A (en) | 1965-05-05 |
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