DE3227083C2 - - Google Patents
Info
- Publication number
- DE3227083C2 DE3227083C2 DE3227083A DE3227083A DE3227083C2 DE 3227083 C2 DE3227083 C2 DE 3227083C2 DE 3227083 A DE3227083 A DE 3227083A DE 3227083 A DE3227083 A DE 3227083A DE 3227083 C2 DE3227083 C2 DE 3227083C2
- Authority
- DE
- Germany
- Prior art keywords
- light
- cable
- fiber
- optical
- laser
- 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 - Fee Related
Links
- 239000000835 fiber Substances 0.000 claims description 63
- 230000005540 biological transmission Effects 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 26
- 239000013307 optical fiber Substances 0.000 claims description 23
- 239000000523 sample Substances 0.000 claims description 22
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 229910052779 Neodymium Inorganic materials 0.000 claims description 9
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000005405 multipole Effects 0.000 claims description 2
- 239000013078 crystal Substances 0.000 description 9
- 229920003023 plastic Polymers 0.000 description 8
- 239000004033 plastic Substances 0.000 description 7
- 230000002787 reinforcement Effects 0.000 description 7
- 239000004020 conductor Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical group [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- -1 neodymium ions Chemical class 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
- E21B47/135—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency using light waves, e.g. infrared or ultraviolet waves
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
- D07B1/147—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising electric conductors or elements for information transfer
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Optics & Photonics (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Geology (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Signal Processing (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Optical Communication System (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Earth Drilling (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28514681A | 1981-07-20 | 1981-07-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3227083A1 DE3227083A1 (de) | 1983-04-21 |
| DE3227083C2 true DE3227083C2 (no) | 1992-10-08 |
Family
ID=23092929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19823227083 Granted DE3227083A1 (de) | 1981-07-20 | 1982-07-17 | Optisches uebertragungssystem fuer bohrlochsonden |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5866196A (no) |
| CA (1) | CA1202081A (no) |
| DE (1) | DE3227083A1 (no) |
| ES (1) | ES8401565A1 (no) |
| FR (1) | FR2513307B1 (no) |
| GB (2) | GB2104752B (no) |
| IT (1) | IT1207302B (no) |
| NO (1) | NO160955C (no) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4324500A1 (de) * | 1992-07-21 | 1994-01-27 | Sanyo Electric Co | Mikromaschinen |
| DE19705920A1 (de) * | 1997-02-17 | 1998-08-20 | Schott Glaswerke | Ummanteltes Glasfaserbündel und Verfahren zu seiner Herstellung |
| DE19807891A1 (de) * | 1998-02-25 | 1999-08-26 | Abb Research Ltd | Faserlaser-Drucksensor |
| DE10344875A1 (de) * | 2003-09-26 | 2005-04-28 | Siemens Ag | Datenübertragungsverfahren und Optischer Drehübertrager mit Durchführung |
Families Citing this family (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4696542A (en) * | 1982-08-17 | 1987-09-29 | Chevron Research Company | Armored optical fiber cable |
| US4523804A (en) * | 1982-08-17 | 1985-06-18 | Chevron Research Company | Armored optical fiber cable |
| US4522464A (en) * | 1982-08-17 | 1985-06-11 | Chevron Research Company | Armored cable containing a hermetically sealed tube incorporating an optical fiber |
| GB2137040B (en) * | 1983-03-23 | 1986-11-19 | Smiths Industries Plc | Tyre pressure sensing system |
| US4596050A (en) * | 1984-04-26 | 1986-06-17 | Rogers Gordon W | Information processing system using optically encoded signals |
| DE3422271A1 (de) * | 1984-06-15 | 1985-12-19 | Bergwerksverband Gmbh, 4300 Essen | Bohrlochuntersuchungsverfahren |
| US4721355A (en) * | 1984-06-22 | 1988-01-26 | Chevron Research Company | Optical cable connector assembly including breakable link and process using same |
| US4849753A (en) * | 1984-08-15 | 1989-07-18 | Chevron Research Company | Electro optic high temperature well bore modulator |
| DE3444309A1 (de) * | 1984-12-05 | 1986-06-19 | Heinrich Wüst KG, 7536 Ispringen | Netzadapter mit automatischer anpassung an die netzspannung |
| GB8432123D0 (en) * | 1984-12-19 | 1985-01-30 | Telephone Cables Ltd | Optical cables |
| NO158039C (no) * | 1985-03-01 | 1988-06-29 | Standard Tel Kabelfab As | Borehulls-loggekabel. |
| US4759601A (en) * | 1985-06-24 | 1988-07-26 | Schlumberger Technology Corporation | Fiber optic connector assembly |
| JPS622412A (ja) * | 1985-06-28 | 1987-01-08 | 株式会社フジクラ | 光ファイバ複合架空線 |
| US4687293A (en) * | 1985-12-27 | 1987-08-18 | Conax Buffalo Corporation | Metal-encased light conductor |
| GB2196809B (en) * | 1986-10-23 | 1991-05-22 | Plessey Co Plc | Optical communication system |
| GB2197066B (en) * | 1986-11-05 | 1990-11-21 | Plessey Co Plc | Improvements relating to bathythermographs |
| IT1202720B (it) * | 1987-03-31 | 1989-02-09 | Pirelli Cavi Spa | Cavo per il trasporto di energia elettrica e la trasmissione di seganli ottici |
| CA1297157C (en) * | 1987-07-13 | 1992-03-10 | Geoffrey Nelson Bowling | Closed loop, programmable power and communication system |
| GB2226270B (en) * | 1988-12-22 | 1992-05-13 | Stc Plc | Optical fibre cables |
| US4974926A (en) * | 1989-04-06 | 1990-12-04 | At&T Bell Laboratories | Underwater optical fiber cable |
| US5140319A (en) * | 1990-06-15 | 1992-08-18 | Westech Geophysical, Inc. | Video logging system having remote power source |
| US5202944A (en) * | 1990-06-15 | 1993-04-13 | Westech Geophysical, Inc. | Communication and power cable |
| FR2664327B1 (fr) * | 1990-07-04 | 1995-11-10 | Clot Andre | Dispositif de diagraphie en zone claire. |
| FR2745847B1 (fr) * | 1996-03-08 | 2000-09-15 | Inst Francais Du Petrole | Systeme de transmission de mesure comportant un convertisseur optoelectrique |
| US6060662A (en) * | 1998-01-23 | 2000-05-09 | Western Atlas International, Inc. | Fiber optic well logging cable |
| FR2820593B1 (fr) | 2001-02-02 | 2003-05-23 | Schlumberger Services Petrol | Chemin optique |
| GB2417627B (en) * | 2002-07-18 | 2006-07-19 | Pgs Americas Inc | Fiber-optic seismic array telemetry system, and method |
| US6850461B2 (en) | 2002-07-18 | 2005-02-01 | Pgs Americas, Inc. | Fiber-optic seismic array telemetry, system, and method |
| US6980714B2 (en) * | 2003-09-26 | 2005-12-27 | Moog Components Group Inc. | Fiber optic rotary joint and associated reflector assembly |
| US7515774B2 (en) * | 2004-12-20 | 2009-04-07 | Schlumberger Technology Corporation | Methods and apparatus for single fiber optical telemetry |
| US7920765B2 (en) * | 2005-06-09 | 2011-04-05 | Schlumberger Technology Corporation | Ruggedized optical fibers for wellbore electrical cables |
| WO2009099332A1 (en) * | 2008-02-07 | 2009-08-13 | Tecwel As | Data communication link |
| US8571368B2 (en) | 2010-07-21 | 2013-10-29 | Foro Energy, Inc. | Optical fiber configurations for transmission of laser energy over great distances |
| AT13841U1 (de) * | 2013-06-13 | 2014-10-15 | Teufelberger Seil Ges M B H | Drahtseil für stationäre Anwendungen und Verfahren zur Herstellung eines solchen Drahtseils |
| RU2759729C1 (ru) * | 2020-11-03 | 2021-11-17 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военный учебно-научный центр Военно-Морского Флота "Военно-морская академия имени Адмирала флота Советского Союза Н.Г. Кузнецова" | Приемо-передающее оптическое устройство |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7241689U (de) * | 1966-02-03 | 1973-07-05 | Bbc Ag | Vorrichtung zur Übertragung des Meß wertes einer periodisch veränderlichen Meßgroße von einem auf Hochspannungspotenüal liegenden Messort zu einem Anzeigeort mittels Lichtstrahlen |
| DE1954643A1 (de) * | 1968-11-05 | 1970-06-25 | Lehoczky Dipl Ing Kalman | Einrichtung zur Messwertuebertragung zwischen gegeneinander-rotierenden Systemen |
| DE2230658B2 (de) * | 1972-06-22 | 1976-05-26 | Erwin Sick Optik-Elektronik, 7808 Waldkirch | Vorrichtung zur uebertragung von nachrichten durch licht |
| US3905010A (en) * | 1973-10-16 | 1975-09-09 | Basic Sciences Inc | Well bottom hole status system |
| US3903496A (en) * | 1974-06-14 | 1975-09-02 | Morton Stimler | Opto-acoustic hydrophone |
| FR2292294A1 (fr) * | 1974-11-20 | 1976-06-18 | Dassault Electronique | Dispositif pour la transmission simultanee d'une multiplicite d'informations entre deux ensembles tournant l'un par rapport a l'autre |
| GB1538485A (en) * | 1976-01-07 | 1979-01-17 | Rank Organisation Ltd | Opto-electric device |
| US4162400A (en) * | 1977-09-09 | 1979-07-24 | Texaco Inc. | Fiber optic well logging means and method |
| US4156104A (en) * | 1977-10-11 | 1979-05-22 | Bell Telephone Laboratories, Incorporated | Submarine cable for optical communications |
| US4189705A (en) * | 1978-02-17 | 1980-02-19 | Texaco Inc. | Well logging system |
| GB2021282B (en) * | 1978-05-22 | 1982-06-03 | Post Office | Submarine optical fibre cable |
| US4239335A (en) * | 1978-08-28 | 1980-12-16 | Sea-Log Corporation | Fiber reinforced optical fiber cable |
| FR2460492A1 (fr) * | 1979-06-28 | 1981-01-23 | Cables De Lyon Geoffroy Delore | Cable sous-marin a fibres optiques |
| DE3030361C2 (de) * | 1979-08-20 | 1984-04-19 | Sumitomo Electric Industries, Ltd., Osaka | Einrichtung zur Übertragung von Signalen zwischen einer beweglichen und einer ortsfesten Einheit mittels eines auf eine Trommel aufgewickelten, optischen Mehraderkabels |
| FR2475238A1 (fr) * | 1980-02-06 | 1981-08-07 | Lyonnaise Transmiss Optiques | Cable a fibres optiques, etanche a l'eau, et procede et dispositif de fabrication de ce cable |
| JPS5744107A (en) * | 1980-08-29 | 1982-03-12 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber cable and its manufacture |
| US4389645A (en) * | 1980-09-08 | 1983-06-21 | Schlumberger Technology Corporation | Well logging fiber optic communication system |
| US4375313A (en) * | 1980-09-22 | 1983-03-01 | Schlumberger Technology Corporation | Fiber optic cable and core |
| GB2085188B (en) * | 1980-09-26 | 1984-05-23 | Bicc Ltd | An improved optical cable |
| FR2494452A1 (fr) * | 1980-11-20 | 1982-05-21 | Cables De Lyon Geoffroy Delore | Methode de fabrication d'un cable a fibres optiques |
| GB2096656B (en) * | 1981-03-06 | 1985-03-06 | Bridon Ltd | Cables |
-
1982
- 1982-07-09 GB GB08219942A patent/GB2104752B/en not_active Expired
- 1982-07-13 FR FR8212274A patent/FR2513307B1/fr not_active Expired
- 1982-07-16 IT IT8222431A patent/IT1207302B/it active
- 1982-07-17 DE DE19823227083 patent/DE3227083A1/de active Granted
- 1982-07-19 NO NO822483A patent/NO160955C/no unknown
- 1982-07-19 ES ES514133A patent/ES8401565A1/es not_active Expired
- 1982-07-19 JP JP57125603A patent/JPS5866196A/ja active Granted
- 1982-07-20 CA CA000407637A patent/CA1202081A/en not_active Expired
-
1985
- 1985-01-30 GB GB08502296A patent/GB2152235B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4324500A1 (de) * | 1992-07-21 | 1994-01-27 | Sanyo Electric Co | Mikromaschinen |
| DE19705920A1 (de) * | 1997-02-17 | 1998-08-20 | Schott Glaswerke | Ummanteltes Glasfaserbündel und Verfahren zu seiner Herstellung |
| DE19705920C2 (de) * | 1997-02-17 | 1999-12-02 | Schott Glas | Verfahren zur Herstellung von ummantelten Glasbündeln |
| DE19807891A1 (de) * | 1998-02-25 | 1999-08-26 | Abb Research Ltd | Faserlaser-Drucksensor |
| DE10344875A1 (de) * | 2003-09-26 | 2005-04-28 | Siemens Ag | Datenübertragungsverfahren und Optischer Drehübertrager mit Durchführung |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3227083A1 (de) | 1983-04-21 |
| ES514133A0 (es) | 1983-12-16 |
| JPS5866196A (ja) | 1983-04-20 |
| CA1202081A (en) | 1986-03-18 |
| IT8222431A0 (it) | 1982-07-16 |
| GB2104752A (en) | 1983-03-09 |
| IT1207302B (it) | 1989-05-17 |
| FR2513307A1 (fr) | 1983-03-25 |
| FR2513307B1 (fr) | 1986-10-10 |
| NO160955C (no) | 1989-06-14 |
| GB2104752B (en) | 1986-02-19 |
| JPH0259519B2 (no) | 1990-12-12 |
| GB2152235A (en) | 1985-07-31 |
| ES8401565A1 (es) | 1983-12-16 |
| NO822483L (no) | 1983-01-21 |
| NO160955B (no) | 1989-03-06 |
| GB2152235B (en) | 1986-03-05 |
| GB8502296D0 (en) | 1985-02-27 |
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