DE1949129C3 - Vorrichtung zur elektrochemischen Entfernung von Verunreinigungen aus wäßrigen Flüssigkeiten - Google Patents
Vorrichtung zur elektrochemischen Entfernung von Verunreinigungen aus wäßrigen FlüssigkeitenInfo
- Publication number
- DE1949129C3 DE1949129C3 DE1949129A DE1949129A DE1949129C3 DE 1949129 C3 DE1949129 C3 DE 1949129C3 DE 1949129 A DE1949129 A DE 1949129A DE 1949129 A DE1949129 A DE 1949129A DE 1949129 C3 DE1949129 C3 DE 1949129C3
- Authority
- DE
- Germany
- Prior art keywords
- bed
- particles
- electrodes
- solution
- cyanide
- 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
Links
- 239000007788 liquid Substances 0.000 title claims description 10
- 239000000356 contaminant Substances 0.000 title claims 2
- 239000002245 particle Substances 0.000 claims description 39
- 238000012856 packing Methods 0.000 claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 8
- 230000001788 irregular Effects 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 30
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 16
- 150000002500 ions Chemical class 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 150000002825 nitriles Chemical class 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 3
- 229910001430 chromium ion Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- -1 halides Chemical class 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-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
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- YAGKRVSRTSUGEY-UHFFFAOYSA-N ferricyanide Chemical compound [Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-N 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- GTLDTDOJJJZVBW-UHFFFAOYSA-N zinc cyanide Chemical compound [Zn+2].N#[C-].N#[C-] GTLDTDOJJJZVBW-UHFFFAOYSA-N 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F1/46114—Electrodes in particulate form or with conductive and/or non conductive particles between them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4676—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electroreduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4676—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electroreduction
- C02F1/4678—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electroreduction of metals
-
- 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
- Y10S204/00—Chemistry: electrical and wave energy
- Y10S204/13—Purification and treatment of electroplating baths and plating wastes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Electrostatic Separation (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US04/764,255 US4310406A (en) | 1968-10-01 | 1968-10-01 | Apparatus for removing metal ions and other pollutants from aqueous solutions and moist gaseous streams |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE1949129A1 DE1949129A1 (de) | 1970-04-09 |
| DE1949129B2 DE1949129B2 (de) | 1978-06-22 |
| DE1949129C3 true DE1949129C3 (de) | 1979-02-22 |
Family
ID=25070161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1949129A Expired DE1949129C3 (de) | 1968-10-01 | 1969-09-29 | Vorrichtung zur elektrochemischen Entfernung von Verunreinigungen aus wäßrigen Flüssigkeiten |
Country Status (14)
| Country | Link |
|---|---|
| US (2) | US4310406A (enExample) |
| JP (1) | JPS583758B1 (enExample) |
| AT (1) | AT299081B (enExample) |
| BE (1) | BE739684A (enExample) |
| CA (1) | CA1111799A (enExample) |
| DE (1) | DE1949129C3 (enExample) |
| DK (1) | DK132883C (enExample) |
| FR (1) | FR2019621A1 (enExample) |
| GB (1) | GB1279650A (enExample) |
| LU (1) | LU59556A1 (enExample) |
| NL (1) | NL166445C (enExample) |
| NO (1) | NO127000B (enExample) |
| SE (1) | SE354841B (enExample) |
| ZA (1) | ZA696895B (enExample) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5314861B2 (enExample) * | 1972-07-28 | 1978-05-20 | ||
| FR2189323A1 (en) * | 1975-01-20 | 1974-01-25 | Inst Gornog Sib | Tap water purification - by metal hydroxide flocculants from electrolytic cell forming second filter layer |
| FR2388597A1 (fr) * | 1977-04-27 | 1978-11-24 | Sorapec | Procede d'electrolyse |
| EP0010562B1 (fr) * | 1978-10-25 | 1985-02-13 | SORAPEC Société de Recherche et d'Applications Electrochimiques | Procédé d'électrolyse |
| EP0141780A1 (fr) * | 1983-10-11 | 1985-05-15 | Battelle Memorial Institute | Procédé pour la décontamination électrochimique de l'eau |
| DE3703803A1 (de) * | 1987-01-31 | 1988-08-04 | Wolfgang Mauerhoff | Vorrichtung zur nassreinigung von rauchgas |
| DE3705956A1 (de) * | 1987-02-25 | 1988-09-08 | Dornier System Gmbh | Simultane abreicherung von schwermetallen und oxidierbaren schadstoffen aus abwaessern |
| US4882018A (en) * | 1987-03-20 | 1989-11-21 | General Motors Corporation | Electrolytic demetallization of dilute solutions using ion exchange resins |
| US4808281A (en) * | 1988-06-27 | 1989-02-28 | General Motors Corporation | Phosphate coating complex metal surfaces |
| US5308457A (en) * | 1991-04-05 | 1994-05-03 | Catalytica, Inc. | Self-contained system for controlling gaseous emissions from dilute organic sources and a process for using that system |
| US5372690A (en) * | 1992-05-13 | 1994-12-13 | Recra Environmental, Inc. | Apparatus for removing contaminants from an aqueous medium |
| US6280601B1 (en) | 1995-02-28 | 2001-08-28 | Falk Doring | Electrolytic method for sterilization of microorganisms and/or mineralization of organic and/or inorganic substances in ground soil |
| US5738778A (en) * | 1995-02-28 | 1998-04-14 | P + P Geotechnik Gmbh Ingenieure Fur Boden-Und Grundwassersanierungen | Method related to the sterilization of microorganisms and/or to the mineralization of organic substances including microbic metabolites in a ground region and in the ground water by means of electric current |
| ES2157575T3 (es) * | 1996-05-20 | 2001-08-16 | Dinex As | Un metodo y un reactor para la conversion electroquimica de un material, tal como particulas de hollin, que es insoluble en un fluido. |
| JP3003846B2 (ja) * | 1997-04-01 | 2000-01-31 | 核燃料サイクル開発機構 | 流出重油又は原油の処理方法 |
| US6321837B1 (en) | 2000-05-22 | 2001-11-27 | Falk Doering | Method and device for the in-situ elimination of hazardous substances from the groundwater and perched water |
| US6878258B2 (en) * | 2002-02-11 | 2005-04-12 | Applied Materials, Inc. | Apparatus and method for removing contaminants from semiconductor copper electroplating baths |
| US8157981B2 (en) * | 2006-11-22 | 2012-04-17 | Strategic Resource Optimization, LLC | Electrolytic system and method for enhanced release and deposition of sub-surface and surface components |
| US8093442B2 (en) * | 2007-07-23 | 2012-01-10 | Rio Tinto Alcan International Limited | Electrochemical removal of dissociable cyanides |
| US20100072059A1 (en) * | 2008-09-25 | 2010-03-25 | Peters Michael J | Electrolytic System and Method for Enhanced Radiological, Nuclear, and Industrial Decontamination |
| RU2494977C2 (ru) * | 2011-10-28 | 2013-10-10 | Александр Михайлович Свинухов | Способ выделения веществ из электролитов |
| WO2014165937A1 (en) * | 2013-04-12 | 2014-10-16 | Ventseatech Pty Ltd | Apparatus and method for recovery of metals from a body of fluid by electrodeposition |
| CN104624376B (zh) * | 2015-02-05 | 2017-01-25 | 哈尔滨工业大学 | 一种离子液体纯化装置 |
| CN105417799A (zh) * | 2015-12-31 | 2016-03-23 | 中新环科（天津）科技有限公司 | 一种高效环保的电化学污水处理设备 |
| CN105461026A (zh) * | 2015-12-31 | 2016-04-06 | 中新环科（天津）科技有限公司 | 一种高效污水处理设备 |
| CN105461047A (zh) * | 2015-12-31 | 2016-04-06 | 中新环科（天津）科技有限公司 | 一种新型生化电解池 |
| CN105645562A (zh) * | 2015-12-31 | 2016-06-08 | 中新环科（天津）科技有限公司 | 一种环保型污水处理设备 |
| AU2019287495B2 (en) | 2018-06-13 | 2021-09-09 | The Water Company, Llc | Controlled removal of ions from aqueous fluid |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1752050A (en) * | 1927-04-12 | 1930-03-25 | Swan Hunter & Wigham Richardson | Regeneration or purification of lubricating oils |
| US2905323A (en) * | 1956-02-28 | 1959-09-22 | Fairview Photo Service Inc | Apparatus for recovery of silver from spent photographic solutions |
| US3616356A (en) * | 1967-09-18 | 1971-10-26 | Clarence H Roy | Electrolysis in a particulate carbon packing |
-
1968
- 1968-10-01 US US04/764,255 patent/US4310406A/en not_active Expired - Lifetime
-
1969
- 1969-09-29 CA CA063,443A patent/CA1111799A/en not_active Expired
- 1969-09-29 DE DE1949129A patent/DE1949129C3/de not_active Expired
- 1969-09-30 GB GB48104/69A patent/GB1279650A/en not_active Expired
- 1969-09-30 DK DK520269A patent/DK132883C/da active
- 1969-09-30 AT AT922669A patent/AT299081B/de active
- 1969-09-30 ZA ZA696895*A patent/ZA696895B/xx unknown
- 1969-10-01 LU LU59556D patent/LU59556A1/xx unknown
- 1969-10-01 NL NL6914823.A patent/NL166445C/xx not_active IP Right Cessation
- 1969-10-01 FR FR6933516A patent/FR2019621A1/fr not_active Withdrawn
- 1969-10-01 NO NO03905/69A patent/NO127000B/no unknown
- 1969-10-01 BE BE739684D patent/BE739684A/xx unknown
- 1969-10-01 SE SE13539/69A patent/SE354841B/xx unknown
- 1969-10-02 JP JP44078533A patent/JPS583758B1/ja active Granted
-
1981
- 1981-04-20 US US06/255,361 patent/US4383901A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DK132883C (da) | 1976-07-19 |
| AT299081B (de) | 1972-06-12 |
| ZA696895B (en) | 1971-05-27 |
| DE1949129A1 (de) | 1970-04-09 |
| NO127000B (enExample) | 1973-04-24 |
| NL166445B (nl) | 1981-03-16 |
| NL166445C (nl) | 1981-08-17 |
| DK132883B (da) | 1976-02-23 |
| US4310406A (en) | 1982-01-12 |
| JPS583758B1 (enExample) | 1983-01-22 |
| FR2019621A1 (enExample) | 1970-07-03 |
| US4383901A (en) | 1983-05-17 |
| NL6914823A (enExample) | 1970-04-03 |
| CA1111799A (en) | 1981-11-03 |
| DE1949129B2 (de) | 1978-06-22 |
| GB1279650A (en) | 1972-06-28 |
| BE739684A (enExample) | 1970-03-16 |
| LU59556A1 (enExample) | 1970-03-02 |
| SE354841B (enExample) | 1973-03-26 |
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