NO123922B - - Google Patents
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- Publication number
- NO123922B NO123922B NO168759A NO16875967A NO123922B NO 123922 B NO123922 B NO 123922B NO 168759 A NO168759 A NO 168759A NO 16875967 A NO16875967 A NO 16875967A NO 123922 B NO123922 B NO 123922B
- Authority
- NO
- Norway
- Prior art keywords
- membrane
- solutions
- solution
- species
- ion
- Prior art date
Links
- 239000000243 solution Substances 0.000 claims description 216
- 239000012528 membrane Substances 0.000 claims description 147
- 150000002500 ions Chemical class 0.000 claims description 95
- 150000001768 cations Chemical class 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000000605 extraction Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 30
- 238000000926 separation method Methods 0.000 claims description 30
- -1 actinide ions Chemical class 0.000 claims description 23
- 150000001450 anions Chemical class 0.000 claims description 23
- 239000008139 complexing agent Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 229910052768 actinide Inorganic materials 0.000 claims 8
- 125000002091 cationic group Chemical group 0.000 claims 1
- 238000012423 maintenance Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 20
- 239000010949 copper Substances 0.000 description 19
- 238000002474 experimental method Methods 0.000 description 18
- 239000002253 acid Substances 0.000 description 17
- 229910052802 copper Inorganic materials 0.000 description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 229910002007 uranyl nitrate Inorganic materials 0.000 description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 13
- 229910052770 Uranium Inorganic materials 0.000 description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 10
- 229910017604 nitric acid Inorganic materials 0.000 description 10
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 10
- 102100033680 Bombesin receptor-activated protein C6orf89 Human genes 0.000 description 8
- 101710086147 Bombesin receptor-activated protein C6orf89 Proteins 0.000 description 8
- 150000007513 acids Chemical class 0.000 description 8
- 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 7
- 238000000909 electrodialysis Methods 0.000 description 7
- 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 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 6
- 229960003330 pentetic acid Drugs 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000003929 acidic solution Substances 0.000 description 5
- 230000009918 complex formation Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000010668 complexation reaction Methods 0.000 description 4
- 238000007334 copolymerization reaction Methods 0.000 description 4
- 229910001431 copper ion Inorganic materials 0.000 description 4
- WYICGPHECJFCBA-UHFFFAOYSA-N dioxouranium(2+) Chemical compound O=[U+2]=O WYICGPHECJFCBA-UHFFFAOYSA-N 0.000 description 4
- 229940071106 ethylenediaminetetraacetate Drugs 0.000 description 4
- 229920000578 graft copolymer Polymers 0.000 description 4
- 238000005342 ion exchange Methods 0.000 description 4
- VAOCPAMSLUNLGC-UHFFFAOYSA-N metronidazole Chemical compound CC1=NC=C([N+]([O-])=O)N1CCO VAOCPAMSLUNLGC-UHFFFAOYSA-N 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 4
- 230000003472 neutralizing effect Effects 0.000 description 4
- 230000003204 osmotic effect Effects 0.000 description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 3
- 230000000536 complexating effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 229910052746 lanthanum Inorganic materials 0.000 description 3
- 125000001453 quaternary ammonium group Chemical group 0.000 description 3
- 229910052709 silver 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
- 229910001427 strontium ion Inorganic materials 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005341 cation exchange Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000003456 ion exchange resin Substances 0.000 description 2
- 229920003303 ion-exchange polymer Polymers 0.000 description 2
- 150000008040 ionic compounds Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003758 nuclear fuel Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 description 2
- WHOZNOZYMBRCBL-OUKQBFOZSA-N (2E)-2-Tetradecenal Chemical compound CCCCCCCCCCC\C=C\C=O WHOZNOZYMBRCBL-OUKQBFOZSA-N 0.000 description 1
- CHRJZRDFSQHIFI-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;styrene Chemical compound C=CC1=CC=CC=C1.C=CC1=CC=CC=C1C=C CHRJZRDFSQHIFI-UHFFFAOYSA-N 0.000 description 1
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 102100032373 Coiled-coil domain-containing protein 85B Human genes 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 101000868814 Homo sapiens Coiled-coil domain-containing protein 85B Proteins 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 239000004133 Sodium thiosulphate Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000005576 amination reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007265 chloromethylation reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Inorganic materials [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 1
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010559 graft polymerization reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229940044654 phenolsulfonic acid Drugs 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000012453 solvate Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-N sulfonic acid Chemical group OS(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-N 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J47/00—Ion-exchange processes in general; Apparatus therefor
- B01J47/12—Ion-exchange processes in general; Apparatus therefor characterised by the use of ion-exchange material in the form of ribbons, filaments, fibres or sheets, e.g. membranes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57165366A | 1966-08-10 | 1966-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO123922B true NO123922B (de) | 1972-02-07 |
Family
ID=24284545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO168759A NO123922B (de) | 1966-08-10 | 1967-06-26 |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3454490A (de) |
| JP (1) | JPS4810303B1 (de) |
| BE (1) | BE700648A (de) |
| DE (1) | DE1642887A1 (de) |
| GB (1) | GB1136521A (de) |
| IL (1) | IL28143A (de) |
| NL (1) | NL6710450A (de) |
| NO (1) | NO123922B (de) |
| SE (1) | SE333917B (de) |
Families Citing this family (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3957504A (en) * | 1974-11-11 | 1976-05-18 | Allied Chemical Corporation | Membrane hydro-metallurgical extraction process |
| US4357220A (en) * | 1980-02-01 | 1982-11-02 | Eisenmann John L | Method and apparatus for recovering charged ions from solution |
| US4306946A (en) * | 1980-08-18 | 1981-12-22 | General Electric Company | Process for acid recovery from waste water |
| US4312778A (en) * | 1980-10-01 | 1982-01-26 | Standard Oil Company (Indiana) | Membrane separation of catalyst metals from aromatic acid production |
| US4311521A (en) * | 1980-10-01 | 1982-01-19 | Standard Oil Company (Indiana) | Membrane separation of catalyst metals from trimellitic acid production and separation of cobalt from manganese |
| US4617125A (en) * | 1983-09-01 | 1986-10-14 | The United States Of America As Represented By The United States Department Of Energy | Separations by supported liquid membrane cascades |
| US4591439A (en) * | 1984-05-08 | 1986-05-27 | E. I. Du Pont De Nemours And Company | Ion exchange process and apparatus |
| US5198117A (en) * | 1991-12-02 | 1993-03-30 | The Dow Chemical Company | Method and apparatus for preparing an epoxide by anionic dialysis |
| IL101906A0 (en) * | 1992-05-18 | 1992-12-30 | Yissum Res Dev Co | Extraction of electrolytes from aqueous solutions |
| US5531890A (en) * | 1993-05-28 | 1996-07-02 | Atlantic Richfield Company | Oil separation and disposal systems |
| US6001255A (en) * | 1993-07-12 | 1999-12-14 | Eyal; Aharon | Process for the production of water-soluble salts of carboxylic and amino acids |
| DE4328226A1 (de) * | 1993-08-23 | 1995-03-02 | Patrick Altmeier | Stark basische Anionenaustauschermembran und Verfahren zu deren Herstellung |
| AT399349B (de) * | 1993-08-26 | 1995-04-25 | Chemiefaser Lenzing Ag | Verfahren zur reinigung wässeriger lösungen von aminoxiden |
| DE19707200A1 (de) * | 1997-02-24 | 1998-08-27 | Bayer Ag | Dreiphasen-Extraktionskolonne |
| JP3307554B2 (ja) * | 1997-02-25 | 2002-07-24 | 信越化学工業株式会社 | 希土類元素の連続溶媒抽出法 |
| DE19919490B4 (de) * | 1999-04-29 | 2005-04-14 | Forschungszentrum Jülich GmbH | Verfahren zur Abtrennung organischer Substanzen aus einem wässrigen Gemisch |
| EP1184487A1 (de) * | 2000-08-29 | 2002-03-06 | Enthone-OMI (Deutschland) GmbH | Verfahren zur Reinigung eines Elektrolyten |
| DE102004002778C5 (de) * | 2004-01-20 | 2017-04-20 | Enthone Inc. | Verfahren zur Regenerierung von Metallisierungsbädern |
| ES2303973T3 (es) * | 2005-05-25 | 2008-09-01 | Enthone Inc. | Procedimiento y dispositivo para ajustar la concentracion de iones en electrolitos. |
| WO2011065222A1 (ja) * | 2009-11-25 | 2011-06-03 | 栗田工業株式会社 | 窒素化合物含有酸性液の処理装置および処理方法 |
| US9751778B2 (en) * | 2012-06-05 | 2017-09-05 | American Water Works Company, Inc. | Simultaneous recovery of coagulant and acid |
| CA2920256A1 (en) | 2013-08-05 | 2015-02-12 | Gradiant Corporation | Water treatment systems and associated methods |
| CA2925869A1 (en) | 2013-09-23 | 2015-03-26 | Gradiant Corporation | Desalination systems and associated methods |
| US10308526B2 (en) | 2015-02-11 | 2019-06-04 | Gradiant Corporation | Methods and systems for producing treated brines for desalination |
| US10167218B2 (en) | 2015-02-11 | 2019-01-01 | Gradiant Corporation | Production of ultra-high-density brines |
| WO2017019944A1 (en) | 2015-07-29 | 2017-02-02 | Gradiant Corporation | Osmotic desalination methods and associated systems |
| US10245555B2 (en) | 2015-08-14 | 2019-04-02 | Gradiant Corporation | Production of multivalent ion-rich process streams using multi-stage osmotic separation |
| WO2017030932A1 (en) | 2015-08-14 | 2017-02-23 | Gradiant Corporation | Selective retention of multivalent ions |
| US10329206B2 (en) * | 2015-12-16 | 2019-06-25 | University Of Maryland, Baltimore County | Nutrient extraction and recovery device for isolation and separation of target products from animal produced waste streams |
| US20190022550A1 (en) | 2016-01-22 | 2019-01-24 | Gradiant Corporation | Formation of solid salts using high gas flow velocities in humidifiers, such as multi-stage bubble column humidifiers |
| WO2017147113A1 (en) | 2016-02-22 | 2017-08-31 | Gradiant Corporation | Hybrid desalination systems and associated methods |
| CA3109230A1 (en) | 2018-08-22 | 2020-02-27 | Gradiant Corporation | Liquid solution concentration system comprising isolated subsystem and related methods |
| NL2021733B1 (en) | 2018-09-28 | 2020-05-07 | Univ Twente | Method for the production of drinking water |
| WO2022108891A1 (en) | 2020-11-17 | 2022-05-27 | Gradiant Corporaton | Osmotic methods and systems involving energy recovery |
| CN114380335B (zh) * | 2022-01-05 | 2023-03-07 | 中国原子能科学研究院 | 一种含有硝酸铀酰的原料液的浓缩方法 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2937924A (en) * | 1949-09-13 | 1960-05-24 | Schubert Jack | Separation of plutonium from fission products by a colloid removal process |
| US2947688A (en) * | 1957-01-10 | 1960-08-02 | George W Murphy | Process and apparatus for the demineralization of saline water |
| BE608328A (de) * | 1960-09-19 | |||
| FR1387457A (fr) * | 1963-02-07 | 1965-01-29 | Procédé et moyens de séparation des ions métalliques | |
| US3342719A (en) * | 1963-06-05 | 1967-09-19 | American Mach & Foundry | Ion exchange membrane fabrication |
| US3272737A (en) * | 1964-11-02 | 1966-09-13 | Dow Chemical Co | Separation of acids by dialysis with anion-exchange membranes |
-
1966
- 1966-08-10 US US571653A patent/US3454490A/en not_active Expired - Lifetime
-
1967
- 1967-05-30 GB GB24909/67A patent/GB1136521A/en not_active Expired
- 1967-06-13 IL IL28143A patent/IL28143A/xx unknown
- 1967-06-13 SE SE08321/67A patent/SE333917B/xx unknown
- 1967-06-26 NO NO168759A patent/NO123922B/no unknown
- 1967-06-28 BE BE700648D patent/BE700648A/xx unknown
- 1967-07-28 NL NL6710450A patent/NL6710450A/xx unknown
- 1967-07-29 DE DE19671642887 patent/DE1642887A1/de active Pending
- 1967-08-10 JP JP42051044A patent/JPS4810303B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE333917B (de) | 1971-04-05 |
| DE1642887A1 (de) | 1971-04-29 |
| JPS4810303B1 (de) | 1973-04-02 |
| NL6710450A (de) | 1968-02-12 |
| GB1136521A (en) | 1968-12-11 |
| US3454490A (en) | 1969-07-08 |
| BE700648A (de) | 1967-12-01 |
| IL28143A (en) | 1970-10-30 |
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