DE1282412B - Verfahren zum Herstellen von supraleitenden Baendern mit Innenschichten aus einer supraleitenden zweikomponentigen intermetallischen Verbindung - Google Patents
Verfahren zum Herstellen von supraleitenden Baendern mit Innenschichten aus einer supraleitenden zweikomponentigen intermetallischen VerbindungInfo
- Publication number
- DE1282412B DE1282412B DES100910A DES0100910A DE1282412B DE 1282412 B DE1282412 B DE 1282412B DE S100910 A DES100910 A DE S100910A DE S0100910 A DES0100910 A DE S0100910A DE 1282412 B DE1282412 B DE 1282412B
- Authority
- DE
- Germany
- Prior art keywords
- melting component
- superconducting
- tape
- component
- niobium
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 65
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229910000765 intermetallic Inorganic materials 0.000 title claims description 13
- 230000008569 process Effects 0.000 title claims description 9
- 238000002844 melting Methods 0.000 claims description 68
- 230000008018 melting Effects 0.000 claims description 58
- 239000010955 niobium Substances 0.000 claims description 50
- 229910052758 niobium Inorganic materials 0.000 claims description 45
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 36
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 33
- 229910052718 tin Inorganic materials 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 27
- 150000001875 compounds Chemical class 0.000 claims description 12
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000007373 indentation Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 4
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 claims description 2
- 238000007740 vapor deposition Methods 0.000 claims description 2
- 241000251468 Actinopterygii Species 0.000 claims 1
- 239000010410 layer Substances 0.000 description 55
- KJSMVPYGGLPWOE-UHFFFAOYSA-N niobium tin Chemical compound [Nb].[Sn] KJSMVPYGGLPWOE-UHFFFAOYSA-N 0.000 description 12
- 229910000657 niobium-tin Inorganic materials 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 239000002887 superconductor Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000010431 corundum Substances 0.000 description 5
- 229910052593 corundum Inorganic materials 0.000 description 5
- 239000007858 starting material Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- BPAABJIBIBFRST-UHFFFAOYSA-N [V].[V].[V].[Ga] Chemical compound [V].[V].[V].[Ga] BPAABJIBIBFRST-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- UKUJCSBWRBWNAV-UHFFFAOYSA-N [Sn].[V] Chemical compound [Sn].[V] UKUJCSBWRBWNAV-UHFFFAOYSA-N 0.000 description 2
- WMLOOYUARVGOPC-UHFFFAOYSA-N [Ta].[Sn] Chemical compound [Ta].[Sn] WMLOOYUARVGOPC-UHFFFAOYSA-N 0.000 description 2
- PEQFPKIXNHTCSJ-UHFFFAOYSA-N alumane;niobium Chemical compound [AlH3].[Nb] PEQFPKIXNHTCSJ-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910000999 vanadium-gallium Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- 101150107341 RERE gene Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- ZYTNDGXGVOZJBT-UHFFFAOYSA-N niobium Chemical compound [Nb].[Nb].[Nb] ZYTNDGXGVOZJBT-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0184—Manufacture or treatment of devices comprising intermetallic compounds of type A-15, e.g. Nb3Sn
-
- 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
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/922—Static electricity metal bleed-off metallic stock
- Y10S428/9265—Special properties
- Y10S428/93—Electric superconducting
-
- 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
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/80—Material per se process of making same
- Y10S505/812—Stock
- Y10S505/813—Wire, tape, or film
-
- 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
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/80—Material per se process of making same
- Y10S505/815—Process of making per se
-
- 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
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/825—Apparatus per se, device per se, or process of making or operating same
- Y10S505/917—Mechanically manufacturing superconductor
- Y10S505/918—Mechanically manufacturing superconductor with metallurgical heat treating
- Y10S505/919—Reactive formation of superconducting intermetallic compound
-
- 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
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/825—Apparatus per se, device per se, or process of making or operating same
- Y10S505/917—Mechanically manufacturing superconductor
- Y10S505/927—Metallurgically bonding superconductive members
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49014—Superconductor
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12681—Ga-, In-, Tl- or Group VA metal-base component
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12708—Sn-base component
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/12743—Next to refractory [Group IVB, VB, or VIB] metal-base component
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
- Y10T428/12812—Diverse refractory group metal-base components: alternative to or next to each other
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES100910A DE1282412B (de) | 1965-12-11 | 1965-12-11 | Verfahren zum Herstellen von supraleitenden Baendern mit Innenschichten aus einer supraleitenden zweikomponentigen intermetallischen Verbindung |
| AT1009166A AT260322B (de) | 1965-12-11 | 1966-10-31 | Verfahren zur Herstellung von supraleitenden Bändern |
| CH1668666A CH470776A (de) | 1965-12-11 | 1966-11-17 | Verfahren zur Herstellung von supraleitenden Bändern |
| NL6617323A NL6617323A (US06559137-20030506-C00047.png) | 1965-12-11 | 1966-12-09 | |
| US600584A US3443304A (en) | 1965-12-11 | 1966-12-09 | Method of producing superconductive tapes or bands |
| SE16914/66A SE319357B (US06559137-20030506-C00047.png) | 1965-12-11 | 1966-12-09 | |
| FR86934A FR1507392A (fr) | 1965-12-11 | 1966-12-09 | Procédé de fabrication de bandes supraconductrices |
| GB55646/66A GB1103140A (en) | 1965-12-11 | 1966-12-12 | Strip-form superconductors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES100910A DE1282412B (de) | 1965-12-11 | 1965-12-11 | Verfahren zum Herstellen von supraleitenden Baendern mit Innenschichten aus einer supraleitenden zweikomponentigen intermetallischen Verbindung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1282412B true DE1282412B (de) | 1968-11-07 |
Family
ID=7523367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES100910A Pending DE1282412B (de) | 1965-12-11 | 1965-12-11 | Verfahren zum Herstellen von supraleitenden Baendern mit Innenschichten aus einer supraleitenden zweikomponentigen intermetallischen Verbindung |
Country Status (8)
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3533919A (en) * | 1965-02-24 | 1970-10-13 | Nat Res Dev | Manufacture of superconductors |
| US3989475A (en) * | 1975-05-30 | 1976-11-02 | The United States Of America As Represented By The Secretary Of The Navy | Composite superconductors |
| CH603797A5 (US06559137-20030506-C00047.png) * | 1976-01-16 | 1978-08-31 | Bbc Brown Boveri & Cie | |
| GB2222179B (en) * | 1987-10-01 | 1992-04-08 | Gen Electric | Protective coatings for metallic articles |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2451099A (en) * | 1945-08-28 | 1948-10-12 | Gen Motors Corp | Method of uniting metal pieces by means of a bonding layer of predetermined thickness |
| US3181936A (en) * | 1960-12-30 | 1965-05-04 | Gen Electric | Superconductors and method for the preparation thereof |
| US3218693A (en) * | 1962-07-03 | 1965-11-23 | Nat Res Corp | Process of making niobium stannide superconductors |
| US3310862A (en) * | 1962-07-10 | 1967-03-28 | Nat Res Corp | Process for forming niobium-stannide superconductors |
| DE1203965B (de) * | 1963-03-06 | 1965-10-28 | Heraeus Gmbh W C | Verfahren zur Herstellung eines supraleitenden Drahtes |
| US3352008A (en) * | 1963-05-03 | 1967-11-14 | Nat Res Corp | Process of bonding copper foil to foil containing superconductive layer such as niobium stannide |
-
1965
- 1965-12-11 DE DES100910A patent/DE1282412B/de active Pending
-
1966
- 1966-10-31 AT AT1009166A patent/AT260322B/de active
- 1966-11-17 CH CH1668666A patent/CH470776A/de not_active IP Right Cessation
- 1966-12-09 US US600584A patent/US3443304A/en not_active Expired - Lifetime
- 1966-12-09 SE SE16914/66A patent/SE319357B/xx unknown
- 1966-12-09 NL NL6617323A patent/NL6617323A/xx unknown
- 1966-12-09 FR FR86934A patent/FR1507392A/fr not_active Expired
- 1966-12-12 GB GB55646/66A patent/GB1103140A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL6617323A (US06559137-20030506-C00047.png) | 1967-06-12 |
| SE319357B (US06559137-20030506-C00047.png) | 1970-01-12 |
| AT260322B (de) | 1968-02-26 |
| CH470776A (de) | 1969-03-31 |
| US3443304A (en) | 1969-05-13 |
| FR1507392A (fr) | 1967-12-29 |
| GB1103140A (en) | 1968-02-14 |
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