NL185156C - Samenstelling, waarmee een poreuze, permeabele, geconsolideerde massa van siliciumdioxydedeeltjes kan worden gevormd, samenstelling voor het opvullen van een lege ruimte, met consolideerbare, met epoxyhars beklede siliciumdioxydedeeltjes, werkwijze voor de bereiding van een dergelijke samenstelling en werkwijze voor het vormen van een grindpakking of het opvullen van een lege ruimte. - Google Patents
Samenstelling, waarmee een poreuze, permeabele, geconsolideerde massa van siliciumdioxydedeeltjes kan worden gevormd, samenstelling voor het opvullen van een lege ruimte, met consolideerbare, met epoxyhars beklede siliciumdioxydedeeltjes, werkwijze voor de bereiding van een dergelijke samenstelling en werkwijze voor het vormen van een grindpakking of het opvullen van een lege ruimte.Info
- Publication number
- NL185156C NL185156C NLAANVRAGE7808611,A NL7808611A NL185156C NL 185156 C NL185156 C NL 185156C NL 7808611 A NL7808611 A NL 7808611A NL 185156 C NL185156 C NL 185156C
- Authority
- NL
- Netherlands
- Prior art keywords
- composition
- silica particles
- filling
- consolideerbare
- permeable
- Prior art date
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title 2
- 239000004593 Epoxy Substances 0.000 title 1
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 238000012856 packing Methods 0.000 title 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/26—Cellulose ethers
- C08L1/28—Alkyl ethers
- C08L1/284—Alkyl ethers with hydroxylated hydrocarbon radicals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/26—Gel breakers other than bacteria or enzymes
-
- 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
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/926—Packer fluid
-
- 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
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2998—Coated including synthetic resin or polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Epoxy Resins (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/840,083 US4199484A (en) | 1977-10-06 | 1977-10-06 | Gelled water epoxy sand consolidation system |
Publications (3)
Publication Number | Publication Date |
---|---|
NL7808611A NL7808611A (nl) | 1979-04-10 |
NL185156B NL185156B (nl) | 1989-09-01 |
NL185156C true NL185156C (nl) | 1990-02-01 |
Family
ID=25281406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NLAANVRAGE7808611,A NL185156C (nl) | 1977-10-06 | 1978-08-21 | Samenstelling, waarmee een poreuze, permeabele, geconsolideerde massa van siliciumdioxydedeeltjes kan worden gevormd, samenstelling voor het opvullen van een lege ruimte, met consolideerbare, met epoxyhars beklede siliciumdioxydedeeltjes, werkwijze voor de bereiding van een dergelijke samenstelling en werkwijze voor het vormen van een grindpakking of het opvullen van een lege ruimte. |
Country Status (13)
Country | Link |
---|---|
US (1) | US4199484A (sv) |
DE (1) | DE2843452C2 (sv) |
DK (1) | DK443678A (sv) |
EG (1) | EG13556A (sv) |
ES (1) | ES473959A1 (sv) |
FR (1) | FR2416919B1 (sv) |
GB (2) | GB2005277B (sv) |
GR (1) | GR64984B (sv) |
IT (1) | IT1099791B (sv) |
MY (2) | MY8400353A (sv) |
NL (1) | NL185156C (sv) |
NO (1) | NO152011C (sv) |
SE (1) | SE444179B (sv) |
Families Citing this family (78)
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US4368136A (en) * | 1977-10-06 | 1983-01-11 | Halliburton Services | Aqueous gel composition for temporary stabilization of subterranean well formation |
US4552675A (en) * | 1983-08-19 | 1985-11-12 | Fmc Corporation | Composition and method for treating a subterranean formation |
US4552674A (en) * | 1983-08-19 | 1985-11-12 | Fmc Corporation | Composition and method for treating a subterranean formation |
US4665988A (en) * | 1986-04-04 | 1987-05-19 | Halliburton Company | Method of preparation of variable permeability fill material for use in subterranean formations |
US4942186A (en) * | 1987-10-23 | 1990-07-17 | Halliburton Company | Continuously forming and transporting consolidatable resin coated particulate materials in aqueous gels |
US4829100A (en) * | 1987-10-23 | 1989-05-09 | Halliburton Company | Continuously forming and transporting consolidatable resin coated particulate materials in aqueous gels |
US4917188A (en) * | 1989-01-09 | 1990-04-17 | Halliburton Company | Method for setting well casing using a resin coated particulate |
US5128390A (en) * | 1991-01-22 | 1992-07-07 | Halliburton Company | Methods of forming consolidatable resin coated particulate materials in aqueous gels |
US5232961A (en) * | 1991-08-19 | 1993-08-03 | Murphey Joseph R | Hardenable resin compositions and methods |
US5321062A (en) * | 1992-10-20 | 1994-06-14 | Halliburton Company | Substituted alkoxy benzene and use thereof as wetting aid for polyepoxide resins |
US5447199A (en) * | 1993-07-02 | 1995-09-05 | Bj Services Company | Controlled degradation of polymer based aqueous gels |
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US6124246A (en) * | 1997-11-17 | 2000-09-26 | Halliburton Energy Services, Inc. | High temperature epoxy resin compositions, additives and methods |
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US6006835A (en) * | 1998-02-17 | 1999-12-28 | Halliburton Energy Services, Inc. | Methods for sealing subterranean zones using foamed resin |
US6012524A (en) * | 1998-04-14 | 2000-01-11 | Halliburton Energy Services, Inc. | Remedial well bore sealing methods and compositions |
US6068055A (en) | 1998-06-30 | 2000-05-30 | Halliburton Energy Services, Inc. | Well sealing compositions and methods |
US6059035A (en) * | 1998-07-20 | 2000-05-09 | Halliburton Energy Services, Inc. | Subterranean zone sealing methods and compositions |
US6098711A (en) * | 1998-08-18 | 2000-08-08 | Halliburton Energy Services, Inc. | Compositions and methods for sealing pipe in well bores |
US6279652B1 (en) | 1998-09-23 | 2001-08-28 | Halliburton Energy Services, Inc. | Heat insulation compositions and methods |
US6328106B1 (en) * | 1999-02-04 | 2001-12-11 | Halliburton Energy Services, Inc. | Sealing subterranean zones |
US6271181B1 (en) | 1999-02-04 | 2001-08-07 | Halliburton Energy Services, Inc. | Sealing subterranean zones |
US6244344B1 (en) | 1999-02-09 | 2001-06-12 | Halliburton Energy Services, Inc. | Methods and compositions for cementing pipe strings in well bores |
US6234251B1 (en) | 1999-02-22 | 2001-05-22 | Halliburton Energy Services, Inc. | Resilient well cement compositions and methods |
US6321841B1 (en) | 2001-02-21 | 2001-11-27 | Halliburton Energy Services, Inc. | Methods of sealing pipe strings in disposal wells |
US7066284B2 (en) * | 2001-11-14 | 2006-06-27 | Halliburton Energy Services, Inc. | Method and apparatus for a monodiameter wellbore, monodiameter casing, monobore, and/or monowell |
US6702044B2 (en) * | 2002-06-13 | 2004-03-09 | Halliburton Energy Services, Inc. | Methods of consolidating formations or forming chemical casing or both while drilling |
US7222672B2 (en) * | 2004-01-16 | 2007-05-29 | Halliburton Energy Services, Inc. | Wellbore fluids containing additives for removing a filter cake and methods of using the same |
US20050261138A1 (en) * | 2004-05-20 | 2005-11-24 | Robb Ian D | Viscosified treatment fluids comprising scleroglucan or diutan and associated methods |
US7595282B2 (en) * | 2004-05-20 | 2009-09-29 | Halliburton Energy Services, Inc. | Methods and compositions of controlling the rheology of a diutan-containing well treatment fluid at high temperatures |
US7833949B2 (en) * | 2005-01-24 | 2010-11-16 | Schlumberger Technology Corporation | Polysaccharide treatment fluid and method of treating a subterranean formation |
US20080026957A1 (en) * | 2005-01-24 | 2008-01-31 | Gurmen M N | Treatment and Production of Subterranean Formations with Heteropolysaccharides |
US7494957B2 (en) * | 2005-01-24 | 2009-02-24 | Schlumberger Technology Corporation | Energized fluids and methods of use thereof |
US7781380B2 (en) * | 2005-01-24 | 2010-08-24 | Schlumberger Technology Corporation | Methods of treating subterranean formations with heteropolysaccharides based fluids |
US8367589B2 (en) * | 2005-01-24 | 2013-02-05 | Schlumberger Technology Corporation | Polysaccharide treatment fluid and method of treating a subterranean formation |
US7819192B2 (en) * | 2006-02-10 | 2010-10-26 | Halliburton Energy Services, Inc. | Consolidating agent emulsions and associated methods |
US7776796B2 (en) * | 2006-03-20 | 2010-08-17 | Schlumberger Technology Corporation | Methods of treating wellbores with recyclable fluids |
US8569214B2 (en) * | 2007-05-30 | 2013-10-29 | Halliburton Energy Services, Inc. | Methods of using polysaccharide based cement additives |
US8586508B2 (en) * | 2007-05-30 | 2013-11-19 | Halliburton Energy Services, Inc. | Polysaccharide based cement additives |
US7678745B2 (en) | 2007-09-24 | 2010-03-16 | Schlumberger Technology Corporation | Viscosity reduction |
US20090105097A1 (en) * | 2007-10-22 | 2009-04-23 | Carlos Abad | Degradable Friction Reducer |
US7998906B2 (en) * | 2008-08-21 | 2011-08-16 | Halliburton Energy Services, Inc. | Methods and compositions for treating subterranean formations |
RU2516505C2 (ru) * | 2008-08-29 | 2014-05-20 | Басф Се | Способ связывания немонолитных оксидных неорганических материалов этерифицированными аминопласт-смолами, отвержденные композиции из этих материалов и этерифицированные аминосмолы |
US8796188B2 (en) | 2009-11-17 | 2014-08-05 | Baker Hughes Incorporated | Light-weight proppant from heat-treated pumice |
US9725645B2 (en) | 2011-05-03 | 2017-08-08 | Preferred Technology, Llc | Proppant with composite coating |
US8993489B2 (en) | 2011-05-03 | 2015-03-31 | Preferred Technology, Llc | Coated and cured proppants |
US9040467B2 (en) | 2011-05-03 | 2015-05-26 | Preferred Technology, Llc | Coated and cured proppants |
US8763700B2 (en) | 2011-09-02 | 2014-07-01 | Robert Ray McDaniel | Dual function proppants |
US9290690B2 (en) | 2011-05-03 | 2016-03-22 | Preferred Technology, Llc | Coated and cured proppants |
US9562187B2 (en) | 2012-01-23 | 2017-02-07 | Preferred Technology, Llc | Manufacture of polymer coated proppants |
US9518214B2 (en) | 2013-03-15 | 2016-12-13 | Preferred Technology, Llc | Proppant with polyurea-type coating |
US10100247B2 (en) | 2013-05-17 | 2018-10-16 | Preferred Technology, Llc | Proppant with enhanced interparticle bonding |
US9790422B2 (en) | 2014-04-30 | 2017-10-17 | Preferred Technology, Llc | Proppant mixtures |
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US10590337B2 (en) | 2015-05-13 | 2020-03-17 | Preferred Technology, Llc | High performance proppants |
US9862881B2 (en) | 2015-05-13 | 2018-01-09 | Preferred Technology, Llc | Hydrophobic coating of particulates for enhanced well productivity |
US11208591B2 (en) | 2016-11-16 | 2021-12-28 | Preferred Technology, Llc | Hydrophobic coating of particulates for enhanced well productivity |
US10696896B2 (en) | 2016-11-28 | 2020-06-30 | Prefferred Technology, Llc | Durable coatings and uses thereof |
CN106590497A (zh) * | 2016-12-21 | 2017-04-26 | 兰州科天环保节能科技有限公司 | 无甲醛水性接缝剂及其制备方法 |
US11168243B2 (en) | 2018-08-30 | 2021-11-09 | Saudi Arabian Oil Company | Cement compositions including epoxy resin systems for preventing fluid migration |
US11352541B2 (en) | 2018-08-30 | 2022-06-07 | Saudi Arabian Oil Company | Sealing compositions and methods of sealing an annulus of a wellbore |
US10696888B2 (en) | 2018-08-30 | 2020-06-30 | Saudi Arabian Oil Company | Lost circulation material compositions and methods of isolating a lost circulation zone of a wellbore |
US10865340B2 (en) * | 2019-02-28 | 2020-12-15 | Saudi Arabian Oil Company | Coatings for corrosion protection |
US11370956B2 (en) | 2019-12-18 | 2022-06-28 | Saudi Arabian Oil Company | Epoxy-based LCM compositions with controlled viscosity and methods of treating a lost circulation zone of a wellbore |
US11332656B2 (en) | 2019-12-18 | 2022-05-17 | Saudi Arabian Oil Company | LCM composition with controlled viscosity and cure time and methods of treating a lost circulation zone of a wellbore |
US11193052B2 (en) | 2020-02-25 | 2021-12-07 | Saudi Arabian Oil Company | Sealing compositions and methods of plugging and abandoning of a wellbore |
US11236263B2 (en) | 2020-02-26 | 2022-02-01 | Saudi Arabian Oil Company | Method of sand consolidation in petroleum reservoirs |
US20230183556A1 (en) * | 2021-12-14 | 2023-06-15 | Aramco Services Company | Blowing agent incorporated resin systems for consolidating subterranean oil and gas bearing formations |
US11827841B2 (en) | 2021-12-23 | 2023-11-28 | Saudi Arabian Oil Company | Methods of treating lost circulation zones |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3100527A (en) * | 1960-08-22 | 1963-08-13 | Jersey Prod Res Co | Sand consolidation |
US3798191A (en) * | 1961-12-05 | 1974-03-19 | Epoxon Corp | Inorganic cement compositions containing epoxy resin and pozzolan |
GB928127A (en) * | 1962-01-25 | 1963-06-06 | Shell Int Research | Method of consolidating an unconsolidated or substantially unconsolidated mass |
GB971855A (en) * | 1963-04-22 | 1964-10-07 | Shell Int Research | Method for treating a permeable mass |
US3476189A (en) * | 1964-03-26 | 1969-11-04 | Shell Oil Co | Method for consolidating a permeable mass |
US3498380A (en) * | 1969-03-28 | 1970-03-03 | Continental Oil Co | Method for placing gravel packs |
US3621915A (en) * | 1969-10-20 | 1971-11-23 | Shell Oil Co | Method for forming a consolidated gravel pack in a well borehole |
US4021355A (en) * | 1970-12-14 | 1977-05-03 | Halliburton Company | Compositions for fracturing well formations |
US3719663A (en) * | 1971-06-07 | 1973-03-06 | Hercules Inc | Preparation of cellulose ethers |
US3727688A (en) * | 1972-02-09 | 1973-04-17 | Phillips Petroleum Co | Hydraulic fracturing method |
US3898165A (en) * | 1972-04-18 | 1975-08-05 | Halliburton Co | Compositions for fracturing high temperature well formations |
US3776311A (en) * | 1972-09-25 | 1973-12-04 | Halliburton Co | Method of controlling loose sands and the like |
US3844348A (en) * | 1972-12-14 | 1974-10-29 | Phillips Petroleum Co | Method of controlling subterranean formation permeability employing graft-polymerized bacterial gum polysaccharide compositions |
US3827898A (en) * | 1973-04-06 | 1974-08-06 | Hercules Inc | Method of reducing the rate of oxidative degradation of cellulose ether |
GB1453001A (en) * | 1973-06-07 | 1976-10-20 | Halliburton Co | Aqueous sand control dispersion |
US4042032A (en) * | 1973-06-07 | 1977-08-16 | Halliburton Company | Methods of consolidating incompetent subterranean formations using aqueous treating solutions |
US3867986A (en) * | 1974-01-28 | 1975-02-25 | Dow Chemical Co | Method for forming a consolidated gravel pack in a subterranean formation |
US4000781A (en) * | 1975-04-24 | 1977-01-04 | Shell Oil Company | Well treating process for consolidating particles with aqueous emulsions of epoxy resin components |
US4016931A (en) * | 1976-04-22 | 1977-04-12 | The Dow Chemical Company | Method of forming a consolidated gravel pack |
US4074760A (en) * | 1976-11-01 | 1978-02-21 | The Dow Chemical Company | Method for forming a consolidated gravel pack |
-
1977
- 1977-10-06 US US05/840,083 patent/US4199484A/en not_active Expired - Lifetime
-
1978
- 1978-08-04 GR GR56927A patent/GR64984B/el unknown
- 1978-08-21 NL NLAANVRAGE7808611,A patent/NL185156C/xx not_active IP Right Cessation
- 1978-09-01 GB GB7835379A patent/GB2005277B/en not_active Expired
- 1978-09-01 GB GB8107079A patent/GB2075520B/en not_active Expired
- 1978-09-22 FR FR7827241A patent/FR2416919B1/fr not_active Expired
- 1978-10-04 EG EG586/78A patent/EG13556A/xx active
- 1978-10-04 ES ES473959A patent/ES473959A1/es not_active Expired
- 1978-10-05 DK DK443678A patent/DK443678A/da not_active Application Discontinuation
- 1978-10-05 NO NO783374A patent/NO152011C/no unknown
- 1978-10-05 DE DE2843452A patent/DE2843452C2/de not_active Expired
- 1978-10-06 IT IT28536/78A patent/IT1099791B/it active
- 1978-10-06 SE SE7810508A patent/SE444179B/sv not_active IP Right Cessation
-
1984
- 1984-12-30 MY MY353/84A patent/MY8400353A/xx unknown
- 1984-12-30 MY MY354/84A patent/MY8400354A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
DE2843452A1 (de) | 1979-04-19 |
GB2005277A (en) | 1979-04-19 |
US4199484A (en) | 1980-04-22 |
NO783374L (no) | 1979-04-09 |
GB2075520B (en) | 1982-09-22 |
SE7810508L (sv) | 1979-04-07 |
GB2075520A (en) | 1981-11-18 |
DK443678A (da) | 1979-04-07 |
ES473959A1 (es) | 1980-03-01 |
IT1099791B (it) | 1985-09-28 |
NO152011B (no) | 1985-04-09 |
GR64984B (en) | 1980-06-11 |
FR2416919A1 (fr) | 1979-09-07 |
DE2843452C2 (de) | 1982-12-09 |
EG13556A (en) | 1982-06-30 |
MY8400354A (en) | 1984-12-31 |
SE444179B (sv) | 1986-03-24 |
NL185156B (nl) | 1989-09-01 |
GB2005277B (en) | 1982-07-14 |
NO152011C (no) | 1985-07-17 |
FR2416919B1 (fr) | 1986-02-28 |
IT7828536A0 (it) | 1978-10-06 |
MY8400353A (en) | 1984-12-31 |
NL7808611A (nl) | 1979-04-10 |
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