DE3802387C2 - - Google Patents
Info
- Publication number
- DE3802387C2 DE3802387C2 DE3802387A DE3802387A DE3802387C2 DE 3802387 C2 DE3802387 C2 DE 3802387C2 DE 3802387 A DE3802387 A DE 3802387A DE 3802387 A DE3802387 A DE 3802387A DE 3802387 C2 DE3802387 C2 DE 3802387C2
- Authority
- DE
- Germany
- Prior art keywords
- workpiece
- cutting blade
- sheet
- cutting
- edge
- 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
- 238000005520 cutting process Methods 0.000 claims description 108
- 238000000926 separation method Methods 0.000 claims description 94
- 238000004140 cleaning Methods 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 43
- 239000012530 fluid Substances 0.000 claims description 41
- 230000008569 process Effects 0.000 claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 230000033001 locomotion Effects 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims 2
- 238000007654 immersion Methods 0.000 claims 1
- 238000000227 grinding Methods 0.000 description 70
- 239000000463 material Substances 0.000 description 29
- 238000012545 processing Methods 0.000 description 24
- 238000003754 machining Methods 0.000 description 22
- 238000010276 construction Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000003082 abrasive agent Substances 0.000 description 9
- 239000010432 diamond Substances 0.000 description 9
- 238000009413 insulation Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 6
- 229910003460 diamond Inorganic materials 0.000 description 6
- 239000010453 quartz Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910001000 nickel titanium Inorganic materials 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- -1 Titanium aluminum compound Chemical class 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 238000003915 air pollution Methods 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H5/00—Combined machining
- B23H5/04—Electrical discharge machining combined with mechanical working
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H5/00—Combined machining
- B23H5/06—Electrochemical machining combined with mechanical working, e.g. grinding or honing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/0608—Grinders for cutting-off using a saw movable on slideways
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/12—Saw-blades or saw-discs specially adapted for working stone
- B28D1/127—Straight, i.e. flat, saw blades; strap saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/0058—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material
- B28D5/007—Use, recovery or regeneration of abrasive mediums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/04—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools
- B28D5/042—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools by cutting with blades or wires mounted in a reciprocating frame
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987031009U JPS63166363U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1987-03-03 | 1987-03-03 | |
| JP4835487 | 1987-03-03 | ||
| JP62249210A JPS642821A (en) | 1987-03-03 | 1987-10-02 | Blade cutting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3802387A1 DE3802387A1 (de) | 1988-09-15 |
| DE3802387C2 true DE3802387C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1992-02-06 |
Family
ID=27287167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3802387A Granted DE3802387A1 (de) | 1987-03-03 | 1988-01-27 | Trennverfahren sowie vorrichtung zu seiner durchfuehrung |
Country Status (4)
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10238593A1 (de) * | 2002-08-22 | 2004-03-11 | Wacker Siltronic Ag | Verfahren zur Herstellung von Halbleiterscheiben |
| DE102010027238B4 (de) * | 2010-07-15 | 2014-05-15 | Siemens Aktiengesellschaft | Verwendung einer Sägevorrichtung und Verfahren zur Herstellung eines in Szintillatorelemente strukturierten Szintillators sowie Szintillator mit Szintillatorelementen |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02303724A (ja) * | 1989-05-19 | 1990-12-17 | Akio Nakano | 超音波加工方法 |
| US5193518A (en) * | 1991-11-13 | 1993-03-16 | Diamond Products, Inc. | Portable wire saw |
| US5542395A (en) * | 1993-11-15 | 1996-08-06 | Walbro Corporation | Temperature-compensated engine fuel delivery |
| US5527441A (en) * | 1994-05-04 | 1996-06-18 | General Electric Company | Welding electrode with flat blade |
| US5387331A (en) * | 1994-05-19 | 1995-02-07 | The United States Of America As Represented By The Secretary Of The Air Force | Wafer cutting device |
| JPH09103940A (ja) * | 1995-08-07 | 1997-04-22 | Ricoh Co Ltd | 電解インプロセスドレッシング研削砥石および電解インプロセスドレッシング研削方法および電解インプロセスドレッシング研削装置 |
| JP2000079561A (ja) * | 1998-09-04 | 2000-03-21 | Inst Of Physical & Chemical Res | 単結晶ＳｉＣの切断・鏡面加工方法及び装置 |
| US6463920B1 (en) * | 1999-11-22 | 2002-10-15 | Sumitomo Special Metals Co., Ltd. | Work cutting apparatus and work cutting method |
| JP4258592B2 (ja) * | 2000-01-26 | 2009-04-30 | 独立行政法人理化学研究所 | インゴット切断装置とその方法 |
| US6485630B1 (en) | 2000-08-02 | 2002-11-26 | Ford Global Technologies, Inc. | Method of reducing wear in lubricated metal cutting operation |
| JP2003053723A (ja) * | 2001-08-10 | 2003-02-26 | Denso Corp | 硬脆材料の切断方法 |
| US6845767B2 (en) * | 2002-05-14 | 2005-01-25 | Diamant Boart, Inc. | Segmented diamond blade with undercut protection |
| JP4750519B2 (ja) * | 2005-09-16 | 2011-08-17 | 株式会社ディスコ | 切削方法および切削装置 |
| KR100680851B1 (ko) * | 2006-02-28 | 2007-02-09 | 이화다이아몬드공업 주식회사 | 수평 왕복운동형 절삭팁 및 절삭공구 |
| US8529736B2 (en) * | 2010-05-25 | 2013-09-10 | General Electric Company | System and method for metal cutting |
| JP5758111B2 (ja) * | 2010-12-02 | 2015-08-05 | 株式会社ディスコ | 切削装置 |
| CN105397640B (zh) * | 2015-12-16 | 2018-01-02 | 郑州磨料磨具磨削研究所有限公司 | 一种复合式超硬砂轮修整器 |
| WO2017201047A1 (en) * | 2016-05-18 | 2017-11-23 | The Board Of Regents Of The Nevada System Of Higher Education On Behalf Of The University Of Nevada, Las Vegas | Electrical potential machining devices and methods |
| CN106493861B (zh) * | 2016-09-14 | 2019-06-18 | 西安理工大学 | 硬脆材料的超声作用下微细切削加工系统 |
| CN106378875B (zh) * | 2016-09-14 | 2019-03-26 | 西安理工大学 | 适用于硬脆材料的微细切削加工系统及其应用 |
| US11529163B2 (en) | 2018-04-02 | 2022-12-20 | Stryker European Holdings I, Llc | Surgical systems and tools for moving energy applicators in superimposed modes |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR957122A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1950-02-16 | |||
| US2967381A (en) * | 1958-04-07 | 1961-01-10 | Bendix Corp | Means for cutting |
| US3061529A (en) * | 1959-04-06 | 1962-10-30 | Norton Co | Electrolytic grinder and method of grinding |
| DE1445263C3 (de) * | 1961-12-12 | 1979-12-13 | Dr. Beck & Co Ag, 2000 Hamburg | Verwendung von Polyesterimiden für die Einbrennisolierung auf elektrischen Leitern |
| US3176675A (en) * | 1962-01-08 | 1965-04-06 | William S Bomba | Hydraulic cutting blades for stone sawing machines |
| US3122628A (en) * | 1963-01-31 | 1964-02-25 | Inone Kiyoshi | Electrical discharge grinding apparatus with automatic electrode reshaping provision |
| GB1050424A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1963-03-25 | |||
| US3394502A (en) * | 1964-03-30 | 1968-07-30 | Mid West Abrasive Co | Solid abrasive article and method of making honing elements therefrom |
| GB1247910A (en) * | 1967-12-04 | 1971-09-29 | Hammond Machinery Builders Inc | Cleaning method and means for electro-chemical grinder |
| DE1989764U (de) * | 1968-04-20 | 1968-07-18 | Winter & Sohn Ernst | Diamantbestuecktes gattersaegeblatt. |
| US3896012A (en) * | 1972-06-27 | 1975-07-22 | Polygraph Leipzig | Electrochemical metal-removal method |
| CH602302A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1975-08-20 | 1978-07-31 | Siemens Ag | |
| US4187828A (en) * | 1977-02-11 | 1980-02-12 | Crystal Systems, Inc. | Cutting |
| GB2000055B (en) * | 1977-06-14 | 1982-03-03 | Inoue Japax Research Incorporated | Method of and apparatus for shaping workpieces |
| SU841889A1 (ru) * | 1978-05-03 | 1981-06-30 | Ордена Трудового Красного Знамениэкспериментальный Научно-Исследо-Вательский Институт Металлорежу-Щих Ctahkob | Способ обработки токопровод щимАбРАзиВНыМ иНСТРуМЕНТОМ и уСТРОйСТВОК шлифОВАльНОМу СТАНКу дл ЕгООСущЕСТВлЕНи |
| JPS60263664A (ja) * | 1984-06-08 | 1985-12-27 | Hirabayashi:Kk | 多刃式切断機のブレ−ド部の往復移動機構 |
-
1987
- 1987-12-30 US US07/139,752 patent/US4920946A/en not_active Expired - Fee Related
- 1987-12-31 KR KR1019870015745A patent/KR930007110B1/ko not_active Expired - Fee Related
-
1988
- 1988-01-27 DE DE3802387A patent/DE3802387A1/de active Granted
- 1988-02-22 GB GB8804071A patent/GB2203084B/en not_active Expired - Fee Related
- 1988-11-03 US US07/266,703 patent/US4930486A/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10238593A1 (de) * | 2002-08-22 | 2004-03-11 | Wacker Siltronic Ag | Verfahren zur Herstellung von Halbleiterscheiben |
| DE102010027238B4 (de) * | 2010-07-15 | 2014-05-15 | Siemens Aktiengesellschaft | Verwendung einer Sägevorrichtung und Verfahren zur Herstellung eines in Szintillatorelemente strukturierten Szintillators sowie Szintillator mit Szintillatorelementen |
Also Published As
| Publication number | Publication date |
|---|---|
| US4920946A (en) | 1990-05-01 |
| GB2203084A (en) | 1988-10-12 |
| KR880010870A (ko) | 1988-10-25 |
| US4930486A (en) | 1990-06-05 |
| KR930007110B1 (ko) | 1993-07-30 |
| GB8804071D0 (en) | 1988-03-23 |
| GB2203084B (en) | 1991-05-22 |
| DE3802387A1 (de) | 1988-09-15 |
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