NO132722B - - Google Patents
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- Publication number
- NO132722B NO132722B NO4503/71A NO450371A NO132722B NO 132722 B NO132722 B NO 132722B NO 4503/71 A NO4503/71 A NO 4503/71A NO 450371 A NO450371 A NO 450371A NO 132722 B NO132722 B NO 132722B
- Authority
- NO
- Norway
- Prior art keywords
- liquid
- treatment
- stated
- sump
- electrodes
- Prior art date
Links
- 239000007788 liquid Substances 0.000 claims description 118
- 239000000126 substance Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 28
- 239000010802 sludge Substances 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 14
- 230000010349 pulsation Effects 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 238000005188 flotation Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 230000029142 excretion Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002800 charge carrier Substances 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 description 14
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000005755 formation reaction Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000011049 filling Methods 0.000 description 7
- 239000006260 foam Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 230000032258 transport Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002195 soluble material Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- PZBPKYOVPCNPJY-UHFFFAOYSA-N 1-[2-(allyloxy)-2-(2,4-dichlorophenyl)ethyl]imidazole Chemical compound ClC1=CC(Cl)=CC=C1C(OCC=C)CN1C=NC=C1 PZBPKYOVPCNPJY-UHFFFAOYSA-N 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-N peroxydisulfuric acid Chemical compound OS(=O)(=O)OOS(O)(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- -1 sodium chloride Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002351 wastewater Substances 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
- C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
-
- 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
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2001/46119—Cleaning the electrodes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4613—Inversing polarity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4616—Power supply
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)
- Closures For Containers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT1098370A AT310100B (de) | 1970-12-07 | 1970-12-07 | Verfahren zur Reinigung von wässerigen Flüssigkeiten, die mit störenden Stoffen belastet sind |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO132722B true NO132722B (fr) | 1975-09-15 |
| NO132722C NO132722C (fr) | 1975-12-22 |
Family
ID=3626007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO4503/71A NO132722C (fr) | 1970-12-07 | 1971-12-07 |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3767046A (fr) |
| AT (1) | AT310100B (fr) |
| BE (1) | BE776365A (fr) |
| CH (1) | CH535602A (fr) |
| DE (1) | DE2158791C3 (fr) |
| FI (1) | FI59379C (fr) |
| FR (1) | FR2116435B1 (fr) |
| IL (1) | IL38313A (fr) |
| IT (1) | IT943778B (fr) |
| NO (1) | NO132722C (fr) |
| SE (1) | SE386152B (fr) |
Families Citing this family (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1402753A (en) * | 1972-03-07 | 1975-08-13 | Camper Nicholsons Holdings Ltd | Water purification control circuit |
| FI48620C (fi) * | 1973-04-17 | 1974-11-11 | Kajaani Oy | Laitteisto kemikaalien määrittämiseksi näytevirrasta. |
| US3933606A (en) * | 1973-12-03 | 1976-01-20 | Saul Gesler | Water treatment process and apparatus |
| US4094755A (en) * | 1974-07-11 | 1978-06-13 | Westinghouse Electric Corporation | Water purification method |
| US4209389A (en) * | 1974-07-29 | 1980-06-24 | Hartkorn Karl Heinz | Microbiological method for removing pathogenic microbes and dissolved organic materials from liquids |
| US4218315A (en) * | 1974-07-29 | 1980-08-19 | Hartkorn Karl Heinz | Oxidation and adsorption method for removing contaminating substances from liquids |
| US3970536A (en) * | 1974-08-22 | 1976-07-20 | Hydromation Filter Company | Liquid treating method and apparatus |
| GB1527292A (en) * | 1976-04-21 | 1978-10-04 | Hartley Simon Ltd | Electrolytic flotation |
| CH619433A5 (fr) * | 1976-07-02 | 1980-09-30 | Ciba Geigy Ag | |
| DE2808225A1 (de) * | 1978-02-25 | 1979-08-30 | Bayer Ag | Verfahren zur elektrophoretischen brechung von emulsionen |
| EP0187720A3 (fr) * | 1985-01-10 | 1987-12-09 | Showakoki Co., Ltd. | Procédé et dispositif pour l'élimination d'impuretés des liquides |
| DE3610061A1 (de) * | 1986-03-25 | 1987-10-01 | Peroxid Chemie Gmbh | Verfahren zur aktivierung von wasserstoffperoxid auf elektrochemischem wege |
| DE3705956A1 (de) * | 1987-02-25 | 1988-09-08 | Dornier System Gmbh | Simultane abreicherung von schwermetallen und oxidierbaren schadstoffen aus abwaessern |
| JP3325081B2 (ja) * | 1993-06-28 | 2002-09-17 | 英雄 早川 | 水の浄化方法及びその装置 |
| EP0686604A1 (fr) * | 1994-06-09 | 1995-12-13 | KLOSE ABWASSERTECHNIK GmbH | Dispositif pour l'épuration des eaux usées par électroflottation |
| US5512171A (en) * | 1995-01-31 | 1996-04-30 | Essop; Saleam | Particle separator |
| US5783089A (en) * | 1995-07-19 | 1998-07-21 | Sorin, Inc. | Method and apparatus for waste water treatment |
| NL1014806C2 (nl) * | 2000-03-31 | 2001-10-02 | Aqua Consult & Design B V | Inrichting en werkwijze voor het elektrochemisch uit een vloeibaar medium verwijderen van stoffen. |
| CA2381681A1 (fr) * | 2001-04-12 | 2002-10-12 | Envirogain Inc. | Systeme et methode de separation des composants du purin |
| US20040099608A1 (en) * | 2002-11-18 | 2004-05-27 | Leffler Charles E. | Ballast water treatment system |
| TWI309579B (en) * | 2003-11-06 | 2009-05-11 | Sanyo Electric Co | Method for preparing coagulant, and method for coagulation treatment of fluid |
| ITMI20041974A1 (it) * | 2004-10-18 | 2005-01-18 | De Nora Elettrodi Spa | Miglioramento del processo di abbattimento del cod per ossidazione elettrochimica |
| MXPA06007148A (es) * | 2006-06-21 | 2007-04-23 | Alcocer Juan Jorge Diaz Gonzal | Metodo y sistema integral para tratamiento de aguas para las torres de enfriamiento y procesos que requieren eliminar la silice del agua. |
| KR101397606B1 (ko) * | 2006-08-08 | 2014-05-27 | 가부시키가이샤 고가네이 | 물정화 방법과 그 장치 |
| WO2008026462A1 (fr) * | 2006-08-29 | 2008-03-06 | Koganei Corporation | Procédé de purification de l'eau et système associé |
| TWI439571B (zh) * | 2007-01-15 | 2014-06-01 | Shibaura Mechatronics Corp | Sulfuric acid electrolysis device, electrolysis method and substrate processing device |
| US20100187130A1 (en) * | 2009-01-29 | 2010-07-29 | Total Separation Solutions, Llc. | Coagulants made in situ from sulfate-containing water and uses therewith |
| FI20105040A (fi) * | 2010-01-19 | 2011-07-20 | Savcor Forest Oy | Menetelmä ja laitteisto veden puhdistamiseksi sähkökemiallisesti |
| CA2758872A1 (fr) | 2011-04-07 | 2012-10-07 | Dpra Canada Incorporated | Appareillage et procede electrocinetique de densification de residus de sables bitumineux |
| US9428408B2 (en) * | 2013-10-07 | 2016-08-30 | Dpra Canada Incorporated | Method and apparatus for treating tailings using an AC voltage with a DC offset |
| CN105813986A (zh) * | 2013-10-07 | 2016-07-27 | 电动力学解决方案股份有限公司 | 使用具有直流偏移的交流电压处理尾矿的方法和装置 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US398101A (en) * | 1889-02-19 | William webster | ||
| US892486A (en) * | 1908-01-11 | 1908-07-07 | Albert Edward Woolf | Process for purifying water and sewage. |
| US930023A (en) * | 1908-08-05 | 1909-08-03 | Charles B Bartley | Process of sterilizing fluids. |
| US1069169A (en) * | 1911-02-28 | 1913-08-05 | Improved Paper Machinery Company | Separating apparatus. |
| US1378120A (en) * | 1916-12-20 | 1921-05-17 | Clarence P Landreth | Method of and apparatus for treating liquid |
| DE905360C (de) * | 1951-12-22 | 1954-03-01 | Hans Hausner | Verfahren und Vorrichtung zur elektrolytischen Reinigung von Wasser oder Rueckgewinnung von Metallen aus Abwaessern |
| DE1177081B (de) * | 1960-04-06 | 1964-08-27 | Guldager Electrolyse | Verfahren zur elektrolytischen Entfernung von kolloidalen Stoffen aus netzmittelhaltigem Abwasser |
| US3518174A (en) * | 1967-08-10 | 1970-06-30 | Inoue K | Method and apparatus for purification of water containing organic contaminants |
| US3600286A (en) * | 1968-02-26 | 1971-08-17 | Selectro Chem Co | Electrolytic treatment of aqueous solutions |
| US3664951A (en) * | 1970-07-22 | 1972-05-23 | Pollution Engineering Internat | Apparatus and process to treat waste water for pollution control and industrial reuse |
-
1970
- 1970-12-07 AT AT1098370A patent/AT310100B/de not_active IP Right Cessation
-
1971
- 1971-11-26 DE DE2158791A patent/DE2158791C3/de not_active Expired
- 1971-11-30 CH CH1738771A patent/CH535602A/de not_active IP Right Cessation
- 1971-11-30 FR FR7142927A patent/FR2116435B1/fr not_active Expired
- 1971-12-06 US US00205171A patent/US3767046A/en not_active Expired - Lifetime
- 1971-12-07 IT IT32129/71A patent/IT943778B/it active
- 1971-12-07 IL IL38313A patent/IL38313A/en unknown
- 1971-12-07 BE BE776365A patent/BE776365A/fr unknown
- 1971-12-07 SE SE7115665A patent/SE386152B/xx unknown
- 1971-12-07 FI FI3488/72A patent/FI59379C/fi active
- 1971-12-07 NO NO4503/71A patent/NO132722C/no unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2116435A1 (fr) | 1972-07-13 |
| NO132722C (fr) | 1975-12-22 |
| CH535602A (de) | 1973-04-15 |
| DE2158791A1 (de) | 1972-06-15 |
| DE2158791C3 (de) | 1982-01-21 |
| FI55641B (fi) | 1979-05-31 |
| SE386152B (sv) | 1976-08-02 |
| BE776365A (fr) | 1972-04-04 |
| AT310100B (de) | 1973-09-10 |
| FI55641C (fi) | 1979-09-10 |
| IT943778B (it) | 1973-04-10 |
| DE2158791B2 (de) | 1981-02-19 |
| FI59379C (fi) | 1981-08-10 |
| FR2116435B1 (fr) | 1976-04-30 |
| IL38313A (en) | 1976-03-31 |
| IL38313A0 (en) | 1972-02-29 |
| US3767046A (en) | 1973-10-23 |
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