DE3537044C2 - Kühlbares, bogenförmiges Wandsegment zum Begrenzen des Strömungsweges in einer axial durchströmten Gasturbine - Google Patents
Kühlbares, bogenförmiges Wandsegment zum Begrenzen des Strömungsweges in einer axial durchströmten GasturbineInfo
- Publication number
- DE3537044C2 DE3537044C2 DE3537044A DE3537044A DE3537044C2 DE 3537044 C2 DE3537044 C2 DE 3537044C2 DE 3537044 A DE3537044 A DE 3537044A DE 3537044 A DE3537044 A DE 3537044A DE 3537044 C2 DE3537044 C2 DE 3537044C2
- Authority
- DE
- Germany
- Prior art keywords
- section
- carrier
- wall segment
- thickness
- coolable
- 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 - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 47
- 239000000919 ceramic Substances 0.000 claims description 39
- 238000002844 melting Methods 0.000 claims description 3
- 230000000670 limiting effect Effects 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 48
- 238000001816 cooling Methods 0.000 description 36
- 238000011144 upstream manufacturing Methods 0.000 description 23
- 230000035882 stress Effects 0.000 description 17
- 238000007789 sealing Methods 0.000 description 11
- 230000035939 shock Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000005524 ceramic coating Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000003362 replicative effect Effects 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910026161 MgAl2O4 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/246—Fastening of diaphragms or stator-rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
- F01D11/122—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with erodable or abradable material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/201—Heat transfer, e.g. cooling by impingement of a 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/684,657 US4650395A (en) | 1984-12-21 | 1984-12-21 | Coolable seal segment for a rotary machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3537044A1 DE3537044A1 (de) | 1986-06-26 |
| DE3537044C2 true DE3537044C2 (de) | 1997-03-13 |
Family
ID=24748997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3537044A Expired - Lifetime DE3537044C2 (de) | 1984-12-21 | 1985-10-17 | Kühlbares, bogenförmiges Wandsegment zum Begrenzen des Strömungsweges in einer axial durchströmten Gasturbine |
Country Status (10)
Families Citing this family (40)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2723144B1 (fr) * | 1984-11-29 | 1996-12-13 | Snecma | Distributeur de turbine |
| FR2603947B1 (fr) * | 1986-09-17 | 1990-11-30 | Snecma | Dispositif de maintien d'un joint d'etancheite sur un bout d'arbre et turbomachine le comportant |
| JPH0158807U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1987-10-07 | 1989-04-13 | ||
| GB8921003D0 (en) * | 1989-09-15 | 1989-11-01 | Rolls Royce Plc | Improvements in or relating to shroud rings |
| GB2239678B (en) * | 1989-12-08 | 1993-03-03 | Rolls Royce Plc | Gas turbine engine blade shroud assembly |
| US5071313A (en) * | 1990-01-16 | 1991-12-10 | General Electric Company | Rotor blade shroud segment |
| DE59102139D1 (de) * | 1990-03-23 | 1994-08-18 | Asea Brown Boveri | Axialdurchströmte Gasturbine. |
| GB2245316B (en) * | 1990-06-21 | 1993-12-15 | Rolls Royce Plc | Improvements in shroud assemblies for turbine rotors |
| US5092735A (en) * | 1990-07-02 | 1992-03-03 | The United States Of America As Represented By The Secretary Of The Air Force | Blade outer air seal cooling system |
| WO1994012775A1 (en) * | 1992-11-24 | 1994-06-09 | United Technologies Corporation | Coolable outer air seal assembly for a turbine |
| US5333992A (en) * | 1993-02-05 | 1994-08-02 | United Technologies Corporation | Coolable outer air seal assembly for a gas turbine engine |
| US5486090A (en) * | 1994-03-30 | 1996-01-23 | United Technologies Corporation | Turbine shroud segment with serpentine cooling channels |
| US5439348A (en) * | 1994-03-30 | 1995-08-08 | United Technologies Corporation | Turbine shroud segment including a coating layer having varying thickness |
| US5423659A (en) * | 1994-04-28 | 1995-06-13 | United Technologies Corporation | Shroud segment having a cut-back retaining hook |
| US5538393A (en) * | 1995-01-31 | 1996-07-23 | United Technologies Corporation | Turbine shroud segment with serpentine cooling channels having a bend passage |
| EP1178182B1 (en) * | 2000-03-07 | 2013-08-14 | Mitsubishi Heavy Industries, Ltd. | Gas turbine split ring |
| FR2857406B1 (fr) * | 2003-07-10 | 2005-09-30 | Snecma Moteurs | Refroidissement des anneaux de turbine |
| DE10334698A1 (de) * | 2003-07-25 | 2005-02-10 | Rolls-Royce Deutschland Ltd & Co Kg | Deckbandsegment für eine Strömungsmaschine |
| US7546683B2 (en) * | 2003-12-29 | 2009-06-16 | General Electric Company | Touch-up of layer paint oxides for gas turbine disks and seals |
| US7665960B2 (en) | 2006-08-10 | 2010-02-23 | United Technologies Corporation | Turbine shroud thermal distortion control |
| US7771160B2 (en) * | 2006-08-10 | 2010-08-10 | United Technologies Corporation | Ceramic shroud assembly |
| US7871244B2 (en) * | 2007-02-15 | 2011-01-18 | Siemens Energy, Inc. | Ring seal for a turbine engine |
| GB0703827D0 (en) | 2007-02-28 | 2007-04-11 | Rolls Royce Plc | Rotor seal segment |
| US8206092B2 (en) * | 2007-12-05 | 2012-06-26 | United Technologies Corp. | Gas turbine engines and related systems involving blade outer air seals |
| US8177492B2 (en) * | 2008-03-04 | 2012-05-15 | United Technologies Corporation | Passage obstruction for improved inlet coolant filling |
| US8622693B2 (en) * | 2009-08-18 | 2014-01-07 | Pratt & Whitney Canada Corp | Blade outer air seal support cooling air distribution system |
| US8167546B2 (en) * | 2009-09-01 | 2012-05-01 | United Technologies Corporation | Ceramic turbine shroud support |
| US8303245B2 (en) * | 2009-10-09 | 2012-11-06 | General Electric Company | Shroud assembly with discourager |
| US8439636B1 (en) * | 2009-10-20 | 2013-05-14 | Florida Turbine Technologies, Inc. | Turbine blade outer air seal |
| RU2615292C2 (ru) * | 2012-01-26 | 2017-04-04 | АНСАЛДО ЭНЕРДЖИА АйПи ЮКей ЛИМИТЕД | Деталь статора с сегментированным внутренним кольцом для турбомашины |
| US9316109B2 (en) * | 2012-04-10 | 2016-04-19 | General Electric Company | Turbine shroud assembly and method of forming |
| US9617866B2 (en) | 2012-07-27 | 2017-04-11 | United Technologies Corporation | Blade outer air seal for a gas turbine engine |
| US10577963B2 (en) * | 2014-01-20 | 2020-03-03 | United Technologies Corporation | Retention clip for a blade outer air seal |
| US10458264B2 (en) * | 2015-05-05 | 2019-10-29 | United Technologies Corporation | Seal arrangement for turbine engine component |
| FR3036432B1 (fr) * | 2015-05-22 | 2019-04-19 | Safran Ceramics | Ensemble d'anneau de turbine avec maintien axial |
| US10132184B2 (en) * | 2016-03-16 | 2018-11-20 | United Technologies Corporation | Boas spring loaded rail shield |
| US10161258B2 (en) * | 2016-03-16 | 2018-12-25 | United Technologies Corporation | Boas rail shield |
| US10329941B2 (en) | 2016-05-06 | 2019-06-25 | United Technologies Corporation | Impingement manifold |
| US10544683B2 (en) * | 2016-08-30 | 2020-01-28 | Rolls-Royce Corporation | Air-film cooled component for a gas turbine engine |
| FR3058755B1 (fr) * | 2016-11-15 | 2020-09-25 | Safran Aircraft Engines | Turbine pour turbomachine |
Family Cites Families (41)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR957575A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1946-10-02 | 1950-02-23 | ||
| BE514728A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1951-10-10 | |||
| GB753224A (en) * | 1953-04-13 | 1956-07-18 | Rolls Royce | Improvements in or relating to blading for turbines or compressors |
| US2787440A (en) * | 1953-05-21 | 1957-04-02 | Westinghouse Electric Corp | Turbine apparatus |
| US2859934A (en) * | 1953-07-29 | 1958-11-11 | Havilland Engine Co Ltd | Gas turbines |
| US2977090A (en) * | 1956-06-12 | 1961-03-28 | Daniel J Mccarty | Heat responsive means for blade cooling |
| US3391904A (en) * | 1966-11-02 | 1968-07-09 | United Aircraft Corp | Optimum response tip seal |
| US3365172A (en) * | 1966-11-02 | 1968-01-23 | Gen Electric | Air cooled shroud seal |
| US3411794A (en) * | 1966-12-12 | 1968-11-19 | Gen Motors Corp | Cooled seal ring |
| GB1266505A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1968-09-17 | 1972-03-08 | ||
| US3814313A (en) * | 1968-10-28 | 1974-06-04 | Gen Motors Corp | Turbine cooling control valve |
| US3575528A (en) * | 1968-10-28 | 1971-04-20 | Gen Motors Corp | Turbine rotor cooling |
| US3736069A (en) * | 1968-10-28 | 1973-05-29 | Gen Motors Corp | Turbine stator cooling control |
| BE756582A (fr) * | 1969-10-02 | 1971-03-01 | Gen Electric | Ecran circulaire et support d'ecran avec dispositif de reglage de la temperature pour turbomachine |
| US3603599A (en) * | 1970-05-06 | 1971-09-07 | Gen Motors Corp | Cooled seal |
| US3742705A (en) * | 1970-12-28 | 1973-07-03 | United Aircraft Corp | Thermal response shroud for rotating body |
| US3817719A (en) * | 1971-07-09 | 1974-06-18 | United Aircraft Corp | High temperature abradable material and method of preparing the same |
| US3879831A (en) * | 1971-11-15 | 1975-04-29 | United Aircraft Corp | Nickle base high temperature abradable material |
| US3781125A (en) * | 1972-04-07 | 1973-12-25 | Westinghouse Electric Corp | Gas turbine nozzle vane structure |
| US3836279A (en) * | 1973-02-23 | 1974-09-17 | United Aircraft Corp | Seal means for blade and shroud |
| US4118496A (en) * | 1974-03-12 | 1978-10-03 | Smith Kline & French Laboratories Limited | Heterocyclic-methylthioalkyl-amidines |
| US3965066A (en) * | 1974-03-15 | 1976-06-22 | General Electric Company | Combustor-turbine nozzle interconnection |
| US3918925A (en) * | 1974-05-13 | 1975-11-11 | United Technologies Corp | Abradable seal |
| US3936656A (en) * | 1974-12-16 | 1976-02-03 | United Technologies Corporation | Method of affixing an abradable metallic fiber material to a metal substrate |
| US4023919A (en) * | 1974-12-19 | 1977-05-17 | General Electric Company | Thermal actuated valve for clearance control |
| US3966356A (en) * | 1975-09-22 | 1976-06-29 | General Motors Corporation | Blade tip seal mount |
| GB1484288A (en) * | 1975-12-03 | 1977-09-01 | Rolls Royce | Gas turbine engines |
| US4076451A (en) * | 1976-03-05 | 1978-02-28 | United Technologies Corporation | Ceramic turbine stator |
| US4127357A (en) * | 1977-06-24 | 1978-11-28 | General Electric Company | Variable shroud for a turbomachine |
| US4157232A (en) * | 1977-10-31 | 1979-06-05 | General Electric Company | Turbine shroud support |
| US4177004A (en) * | 1977-10-31 | 1979-12-04 | General Electric Company | Combined turbine shroud and vane support structure |
| US4247248A (en) * | 1978-12-20 | 1981-01-27 | United Technologies Corporation | Outer air seal support structure for gas turbine engine |
| US4273824A (en) * | 1979-05-11 | 1981-06-16 | United Technologies Corporation | Ceramic faced structures and methods for manufacture thereof |
| US4289446A (en) * | 1979-06-27 | 1981-09-15 | United Technologies Corporation | Ceramic faced outer air seal for gas turbine engines |
| US4337016A (en) * | 1979-12-13 | 1982-06-29 | United Technologies Corporation | Dual wall seal means |
| US4431373A (en) * | 1980-05-16 | 1984-02-14 | United Technologies Corporation | Flow directing assembly for a gas turbine engine |
| IL62818A (en) * | 1980-05-16 | 1985-08-30 | United Technologies Corp | Flow directing assembly for a gas turbine engine |
| GB2081817B (en) * | 1980-08-08 | 1984-02-15 | Rolls Royce | Turbine blade shrouding |
| GB2117843B (en) * | 1982-04-01 | 1985-11-06 | Rolls Royce | Compressor shrouds |
| US4422648A (en) * | 1982-06-17 | 1983-12-27 | United Technologies Corporation | Ceramic faced outer air seal for gas turbine engines |
| US4650394A (en) * | 1984-11-13 | 1987-03-17 | United Technologies Corporation | Coolable seal assembly for a gas turbine engine |
-
1984
- 1984-12-21 US US06/684,657 patent/US4650395A/en not_active Expired - Lifetime
-
1985
- 1985-07-30 CA CA000487783A patent/CA1235070A/en not_active Expired
- 1985-10-04 GB GB8524592A patent/GB2169037B/en not_active Expired
- 1985-10-11 IL IL76660A patent/IL76660A/xx not_active IP Right Cessation
- 1985-10-17 DE DE3537044A patent/DE3537044C2/de not_active Expired - Lifetime
- 1985-10-31 IT IT8522684A patent/IT1186037B/it active
- 1985-10-31 SE SE8505156A patent/SE458624B/sv not_active IP Right Cessation
- 1985-10-31 FR FR8516230A patent/FR2575224B1/fr not_active Expired - Lifetime
- 1985-11-01 CH CH4702/85A patent/CH669976A5/de not_active IP Right Cessation
- 1985-12-20 JP JP60287597A patent/JPH0689654B2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2575224A1 (fr) | 1986-06-27 |
| IT8522684A0 (it) | 1985-10-31 |
| CA1235070A (en) | 1988-04-12 |
| CH669976A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1989-04-28 |
| FR2575224B1 (fr) | 1993-10-15 |
| JPS61157704A (ja) | 1986-07-17 |
| SE458624B (sv) | 1989-04-17 |
| US4650395A (en) | 1987-03-17 |
| GB2169037A (en) | 1986-07-02 |
| IT1186037B (it) | 1987-11-18 |
| JPH0689654B2 (ja) | 1994-11-09 |
| IL76660A0 (en) | 1986-02-28 |
| DE3537044A1 (de) | 1986-06-26 |
| IL76660A (en) | 1992-03-29 |
| SE8505156L (sv) | 1986-06-22 |
| GB8524592D0 (en) | 1985-11-06 |
| GB2169037B (en) | 1989-09-20 |
| SE8505156D0 (sv) | 1985-10-31 |
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