NO783321L - Fremgangsmaate for fremstilling av sammensatte konstruksjoner for vannkjoelte gassturbin-deler - Google Patents
Fremgangsmaate for fremstilling av sammensatte konstruksjoner for vannkjoelte gassturbin-delerInfo
- Publication number
- NO783321L NO783321L NO783321A NO783321A NO783321L NO 783321 L NO783321 L NO 783321L NO 783321 A NO783321 A NO 783321A NO 783321 A NO783321 A NO 783321A NO 783321 L NO783321 L NO 783321L
- Authority
- NO
- Norway
- Prior art keywords
- nickel
- copper
- end walls
- alloy
- powder
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 5
- 239000000203 mixture Substances 0.000 title description 3
- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical group FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 title 1
- 239000002131 composite material Substances 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 30
- 229910052802 copper Inorganic materials 0.000 claims description 21
- 239000010949 copper Substances 0.000 claims description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 238000007731 hot pressing Methods 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims 3
- 229910000570 Cupronickel Inorganic materials 0.000 claims 1
- 229910000792 Monel Inorganic materials 0.000 claims 1
- 238000007596 consolidation process Methods 0.000 claims 1
- 238000005253 cladding Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 238000003466 welding Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000000280 densification Methods 0.000 description 3
- 238000007511 glassblowing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 239000000788 chromium alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel 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
- 238000005266 casting Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000000462 isostatic pressing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 230000000007 visual effect Effects 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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
- F01D5/187—Convection cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/04—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/04—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass turbine or like blades from several pieces
-
- 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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/288—Protective coatings for blades
-
- 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
-
- 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
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/49336—Blade making
- Y10T29/49339—Hollow blade
- Y10T29/49341—Hollow blade with cooling passage
- Y10T29/49343—Passage contains tubular insert
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Powder Metallurgy (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/838,726 US4137619A (en) | 1977-10-03 | 1977-10-03 | Method of fabricating composite structures for water cooled gas turbine components |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO783321L true NO783321L (no) | 1979-04-04 |
Family
ID=25277896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO783321A NO783321L (no) | 1977-10-03 | 1978-10-02 | Fremgangsmaate for fremstilling av sammensatte konstruksjoner for vannkjoelte gassturbin-deler |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4137619A (nl) |
| JP (1) | JPS5464213A (nl) |
| CA (1) | CA1090993A (nl) |
| DE (1) | DE2842688A1 (nl) |
| FR (1) | FR2404486A1 (nl) |
| GB (1) | GB1605056A (nl) |
| IT (1) | IT1099646B (nl) |
| NL (1) | NL7809985A (nl) |
| NO (1) | NO783321L (nl) |
Families Citing this family (51)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH602330A5 (nl) * | 1976-08-26 | 1978-07-31 | Bbc Brown Boveri & Cie | |
| US4259037A (en) * | 1976-12-13 | 1981-03-31 | General Electric Company | Liquid cooled gas turbine buckets |
| US4210269A (en) * | 1978-06-08 | 1980-07-01 | General Electric Company | Method for diffusion bonding sheet claddings to superalloy substrates |
| US4249291A (en) * | 1979-06-01 | 1981-02-10 | General Electric Company | Method for forming a liquid cooled airfoil for a gas turbine |
| US4283822A (en) * | 1979-12-26 | 1981-08-18 | General Electric Company | Method of fabricating composite nozzles for water cooled gas turbines |
| AT376920B (de) * | 1980-02-01 | 1985-01-25 | Uddeholms Ab | Verfahren zum herstellen eines gegenstandes aus einem sinterfaehigen material |
| USRE32389E (en) * | 1980-04-10 | 1987-04-07 | Cameron Iron Works, Inc. | Method of producing a lined structure |
| US4477955A (en) * | 1980-04-10 | 1984-10-23 | Cameron Iron Works, Inc. | Method of producing a lined structure |
| GB2073783B (en) * | 1980-04-10 | 1984-10-10 | Cameron Iron Works Inc | Lining valves by hot isotatic pressing |
| FR2483513A1 (fr) * | 1980-05-28 | 1981-12-04 | Snecma | Procede pour la fabrication d'aubes de turbine refroidies au moyen d'un corps poreux et produit obtenu suivant ce procede |
| US4418124A (en) * | 1980-10-06 | 1983-11-29 | General Electric Company | Plasma spray-cast components |
| US4383854A (en) * | 1980-12-29 | 1983-05-17 | General Electric Company | Method of creating a controlled interior surface configuration of passages within a substrate |
| US4370789A (en) * | 1981-03-20 | 1983-02-01 | Schilke Peter W | Fabrication of gas turbine water-cooled composite nozzle and bucket hardware employing plasma spray process |
| US4418455A (en) * | 1981-05-04 | 1983-12-06 | Electric Power Research Institute, Inc. | Method of manufacturing a fluid cooled blade or vane |
| GB2130244A (en) * | 1982-03-05 | 1984-05-31 | Rolls Royce | Forming coatings by hot isostatic compaction |
| DE3307791A1 (de) * | 1982-03-05 | 1983-10-06 | Rolls Royce | Komposit-bauteil und verfahren zu dessen herstellung |
| DE3241926A1 (de) * | 1982-11-12 | 1984-05-17 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | Verbindung eines keramischen rotationsbauteils mit einem metallischen rotationsbauteil fuer stroemungsmaschinen, insbesondere gasturbinentriebwerke |
| US4492517A (en) * | 1983-01-06 | 1985-01-08 | General Electric Company | Segmented inlet nozzle for gas turbine, and methods of installation |
| US4544523A (en) * | 1983-10-17 | 1985-10-01 | Crucible Materials Corporation | Cladding method for producing a lined alloy article |
| DE3726056A1 (de) * | 1987-08-06 | 1989-03-02 | Mtu Muenchen Gmbh | Verfahren zur herstellung von bauteilen mit unterschiedlichen wandstaerken |
| US5012853A (en) * | 1988-09-20 | 1991-05-07 | Sundstrand Corporation | Process for making articles with smooth complex internal geometries |
| JP2988109B2 (ja) * | 1991-03-20 | 1999-12-06 | 株式会社日立製作所 | 回転電機用ロータシャフト及びそれを用いた回転電機 |
| DE4137839A1 (de) * | 1991-11-16 | 1993-05-19 | Asea Brown Boveri | Verfahren zum anbringen einer erosionsschutzschicht |
| DE69321298T2 (de) * | 1992-06-05 | 1999-04-08 | Gec Alsthom Electromecanique S.A., Paris | Verfahren zur Herstellung eines Einsatzes auf einem zu beschichtenden Formkörper aus Stahl oder aus Titanlegierung |
| US5382135A (en) * | 1992-11-24 | 1995-01-17 | United Technologies Corporation | Rotor blade with cooled integral platform |
| US5344283A (en) * | 1993-01-21 | 1994-09-06 | United Technologies Corporation | Turbine vane having dedicated inner platform cooling |
| US5960249A (en) * | 1998-03-06 | 1999-09-28 | General Electric Company | Method of forming high-temperature components and components formed thereby |
| DE19856199A1 (de) * | 1998-12-05 | 2000-06-08 | Abb Alstom Power Ch Ag | Kühlung in Gasturbinen |
| EP1101900A1 (de) * | 1999-11-16 | 2001-05-23 | Siemens Aktiengesellschaft | Turbinenschaufel und Verfahren zur Herstellung einer Turbinenschaufel |
| US6878412B2 (en) * | 2001-03-26 | 2005-04-12 | Bodycote Imt, Inc. | Corrosion resistant component and method for fabricating same |
| US6709771B2 (en) | 2002-05-24 | 2004-03-23 | Siemens Westinghouse Power Corporation | Hybrid single crystal-powder metallurgy turbine component |
| US6796770B2 (en) * | 2002-11-06 | 2004-09-28 | Spx Corporation | Impeller and method using solid free form fabrication |
| GB2443116B (en) * | 2004-03-25 | 2008-08-13 | Rolls Royce Plc | A gas turbine engine component cooling arrangement |
| GB2412411A (en) * | 2004-03-25 | 2005-09-28 | Rolls Royce Plc | A cooling arrangement |
| US8033790B2 (en) * | 2008-09-26 | 2011-10-11 | Siemens Energy, Inc. | Multiple piece turbine engine airfoil with a structural spar |
| US20110110772A1 (en) * | 2009-11-11 | 2011-05-12 | Arrell Douglas J | Turbine Engine Components with Near Surface Cooling Channels and Methods of Making the Same |
| US8784044B2 (en) | 2011-08-31 | 2014-07-22 | Pratt & Whitney Canada Corp. | Turbine shroud segment |
| US8784041B2 (en) | 2011-08-31 | 2014-07-22 | Pratt & Whitney Canada Corp. | Turbine shroud segment with integrated seal |
| US8784037B2 (en) | 2011-08-31 | 2014-07-22 | Pratt & Whitney Canada Corp. | Turbine shroud segment with integrated impingement plate |
| US9028744B2 (en) | 2011-08-31 | 2015-05-12 | Pratt & Whitney Canada Corp. | Manufacturing of turbine shroud segment with internal cooling passages |
| US9079245B2 (en) | 2011-08-31 | 2015-07-14 | Pratt & Whitney Canada Corp. | Turbine shroud segment with inter-segment overlap |
| US9988932B2 (en) | 2013-12-06 | 2018-06-05 | Honeywell International Inc. | Bi-cast turbine nozzles and methods for cooling slip joints therein |
| US9885245B2 (en) | 2014-05-20 | 2018-02-06 | Honeywell International Inc. | Turbine nozzles and cooling systems for cooling slip joints therein |
| US10907609B2 (en) * | 2014-07-15 | 2021-02-02 | Ge Renewable Technologies | Apparatus and method for modifying a geometry of a turbine part |
| CA2857297C (en) * | 2014-07-21 | 2021-08-17 | Alstom Renewable Technologies | Apparatus and method for modifying a geometry of a turbine part |
| WO2016022139A1 (en) | 2014-08-08 | 2016-02-11 | Siemens Aktiengesellschaft | Hot isostatic pressing system for the assembly of modular components usable in a turbine engine |
| US10502093B2 (en) * | 2017-12-13 | 2019-12-10 | Pratt & Whitney Canada Corp. | Turbine shroud cooling |
| US10533454B2 (en) | 2017-12-13 | 2020-01-14 | Pratt & Whitney Canada Corp. | Turbine shroud cooling |
| US11274569B2 (en) | 2017-12-13 | 2022-03-15 | Pratt & Whitney Canada Corp. | Turbine shroud cooling |
| US10570773B2 (en) | 2017-12-13 | 2020-02-25 | Pratt & Whitney Canada Corp. | Turbine shroud cooling |
| US11365645B2 (en) | 2020-10-07 | 2022-06-21 | Pratt & Whitney Canada Corp. | Turbine shroud cooling |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2888241A (en) * | 1954-06-09 | 1959-05-26 | Stalker Corp | Fabricated cooled turbine blades |
| US2946681A (en) * | 1957-01-31 | 1960-07-26 | Federal Mogul Bower Bearings | Method of providing a body with a porous metal shell |
| US3445481A (en) * | 1965-08-12 | 1969-05-20 | Universal Oil Prod Co | Process for the preparation of dicarboxyalkylidene compounds containing halo substituted bicycloalkene moieties and derivatives thereof |
| US3446482A (en) * | 1967-03-24 | 1969-05-27 | Gen Electric | Liquid cooled turbine rotor |
| US3623825A (en) * | 1969-11-13 | 1971-11-30 | Avco Corp | Liquid-metal-filled rotor blade |
| US3619076A (en) * | 1970-02-02 | 1971-11-09 | Gen Electric | Liquid-cooled turbine bucket |
| GB1301524A (nl) * | 1970-05-22 | 1972-12-29 | ||
| SE350918B (nl) * | 1971-03-26 | 1972-11-13 | Asea Ab | |
| NL7112983A (nl) * | 1971-09-21 | 1973-03-23 | ||
| US3748110A (en) * | 1971-10-27 | 1973-07-24 | Gen Motors Corp | Ductile corrosion resistant coating for nickel base alloy articles |
| JPS4992416A (nl) * | 1972-09-06 | 1974-09-03 | ||
| US3928901A (en) * | 1974-10-10 | 1975-12-30 | Gen Electric | Forming a cladding sheet to a convex/concave substrate |
| US3952939A (en) * | 1975-07-28 | 1976-04-27 | General Electric Company | Sheet cladding method |
| US4017210A (en) * | 1976-02-19 | 1977-04-12 | General Electric Company | Liquid-cooled turbine bucket with integral distribution and metering system |
| US4156582A (en) * | 1976-12-13 | 1979-05-29 | General Electric Company | Liquid cooled gas turbine buckets |
-
1977
- 1977-10-03 US US05/838,726 patent/US4137619A/en not_active Expired - Lifetime
-
1978
- 1978-05-19 GB GB20805/78A patent/GB1605056A/en not_active Expired
- 1978-09-21 CA CA311,803A patent/CA1090993A/en not_active Expired
- 1978-09-29 IT IT28253/78A patent/IT1099646B/it active
- 1978-09-30 DE DE19782842688 patent/DE2842688A1/de active Granted
- 1978-10-02 NO NO783321A patent/NO783321L/no unknown
- 1978-10-03 NL NL7809985A patent/NL7809985A/nl not_active Application Discontinuation
- 1978-10-03 JP JP12127978A patent/JPS5464213A/ja active Granted
- 1978-10-03 FR FR7828201A patent/FR2404486A1/fr active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2404486B1 (nl) | 1983-05-20 |
| IT1099646B (it) | 1985-09-18 |
| DE2842688A1 (de) | 1979-04-05 |
| CA1090993A (en) | 1980-12-09 |
| JPS5464213A (en) | 1979-05-23 |
| US4137619A (en) | 1979-02-06 |
| JPS6119375B2 (nl) | 1986-05-16 |
| FR2404486A1 (fr) | 1979-04-27 |
| NL7809985A (nl) | 1979-04-05 |
| GB1605056A (en) | 1981-12-16 |
| DE2842688C2 (nl) | 1987-10-22 |
| IT7828253A0 (it) | 1978-09-29 |
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