ES2015173A6 - Broca de fresa. - Google Patents
Broca de fresa.Info
- Publication number
- ES2015173A6 ES2015173A6 ES8902576A ES8902576A ES2015173A6 ES 2015173 A6 ES2015173 A6 ES 2015173A6 ES 8902576 A ES8902576 A ES 8902576A ES 8902576 A ES8902576 A ES 8902576A ES 2015173 A6 ES2015173 A6 ES 2015173A6
- Authority
- ES
- Spain
- Prior art keywords
- tip
- socket
- rear end
- wear resistant
- steel
- 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
- 229910000831 Steel Inorganic materials 0.000 abstract 3
- 239000010959 steel Substances 0.000 abstract 3
- 238000009412 basement excavation Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
Classifications
-
- 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
- E21B10/00—Drill bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
- E21C35/1831—Fixing methods or devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
- E21C35/1835—Chemical composition or specific material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
- E21C35/1837—Mining picks; Holders therefor with inserts or layers of wear-resisting material characterised by the shape
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
- Auxiliary Devices For Machine Tools (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
BROCA DE FRESA. SE PRESENTA UNA BROCA DE FRESA PARA USO EN APLICACIONES EN LA CONSTRUCCION Y/O EXCAVACION QUE TIENE UNA PUNTA DURA RESISTENTE AL DESGASTE UNIDA A UNA ESPIGA DE ACERO. LA PUNTA RESISTENTE AL DESGASTE ES GIRATORIA SIMETRICAMENTE ALREDEDOR DE SU EJE LONGITUDINAL Y TIENE UN EXTREMO POSTERIOR QUE TIENE UNA CAJA DE ENCHUFE DENTRO, EN LA QUE SE UNE UNA PROTUSION DE ACERO EXISTENTE SOBRE EL EXTREMO DELANTERO DE LA ESPIGA DE ACERO. LA CAJA DE ENCHUFE DE LA PUNTA Y UNA SUPERFICIE DE APOYO EXTERIOR ULTIMA EN EL EXTREMO POSTERIOR DE LA PUNTA TIENEN RESPECTIVAS PLURALIDADES DE PRIMERAS Y SEGUNDAS CAVIDADES FORMADAS EN ELLAS Y QUE SOBRESALEN PARA ESPACIAR, CENTRAR Y ALINEAR LA PUNTA SOBRE EL CUERPO DE BROCA CON EL FIN DE FACILITAR LA FORMACION DE UNA UNION COBRESOLDADA DE UN PERFIL DE ESPESOR EN LA SECCION TRANSVERSAL DADO DESEADO ENTRE LA PUNTA Y EL CUERPO DE LA BROCA.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/221,839 US4911503A (en) | 1988-07-20 | 1988-07-20 | Earth engaging cutter bit |
US07/303,510 US4940288A (en) | 1988-07-20 | 1989-01-27 | Earth engaging cutter bit |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2015173A6 true ES2015173A6 (es) | 1990-08-01 |
Family
ID=26916196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES8902576A Expired - Lifetime ES2015173A6 (es) | 1988-07-20 | 1989-07-20 | Broca de fresa. |
Country Status (12)
Country | Link |
---|---|
US (1) | US4940288A (es) |
EP (1) | EP0428599B1 (es) |
JP (1) | JPH03503430A (es) |
KR (1) | KR900702170A (es) |
CN (1) | CN1028662C (es) |
AT (1) | ATE117049T1 (es) |
AU (1) | AU617517B2 (es) |
CA (1) | CA1313382C (es) |
DE (1) | DE68920585T2 (es) |
ES (1) | ES2015173A6 (es) |
PL (1) | PL161730B1 (es) |
WO (1) | WO1990001106A1 (es) |
Families Citing this family (89)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5141289A (en) * | 1988-07-20 | 1992-08-25 | Kennametal Inc. | Cemented carbide tip |
US4981328A (en) * | 1989-08-22 | 1991-01-01 | Kennametal Inc. | Rotatable tool having a carbide insert with bumps |
DE19857451A1 (de) | 1998-12-12 | 2000-06-15 | Boart Hwf Gmbh Co Kg | Schneid- oder Brechwerkzeug sowie Schneideinsatz für dieses |
US6196636B1 (en) | 1999-03-22 | 2001-03-06 | Larry J. McSweeney | Cutting bit insert configured in a polygonal pyramid shape and having a ring mounted in surrounding relationship with the insert |
US6554369B2 (en) | 2001-07-12 | 2003-04-29 | The Sollami Company | Cutting tool with hardened insert |
US6851758B2 (en) * | 2002-12-20 | 2005-02-08 | Kennametal Inc. | Rotatable bit having a resilient retainer sleeve with clearance |
US8109349B2 (en) * | 2006-10-26 | 2012-02-07 | Schlumberger Technology Corporation | Thick pointed superhard material |
US7740414B2 (en) | 2005-03-01 | 2010-06-22 | Hall David R | Milling apparatus for a paved surface |
US7950746B2 (en) * | 2006-06-16 | 2011-05-31 | Schlumberger Technology Corporation | Attack tool for degrading materials |
US7568770B2 (en) | 2006-06-16 | 2009-08-04 | Hall David R | Superhard composite material bonded to a steel body |
US7469972B2 (en) * | 2006-06-16 | 2008-12-30 | Hall David R | Wear resistant tool |
US7980582B2 (en) * | 2006-08-09 | 2011-07-19 | Atc Leasing Company Llc | Front tow extended saddle |
US8485609B2 (en) * | 2006-08-11 | 2013-07-16 | Schlumberger Technology Corporation | Impact tool |
US7413256B2 (en) * | 2006-08-11 | 2008-08-19 | Hall David R | Washer for a degradation assembly |
US8136887B2 (en) | 2006-08-11 | 2012-03-20 | Schlumberger Technology Corporation | Non-rotating pick with a pressed in carbide segment |
US8453497B2 (en) | 2006-08-11 | 2013-06-04 | Schlumberger Technology Corporation | Test fixture that positions a cutting element at a positive rake angle |
US7410221B2 (en) * | 2006-08-11 | 2008-08-12 | Hall David R | Retainer sleeve in a degradation assembly |
US7946657B2 (en) * | 2006-08-11 | 2011-05-24 | Schlumberger Technology Corporation | Retention for an insert |
US7648210B2 (en) | 2006-08-11 | 2010-01-19 | Hall David R | Pick with an interlocked bolster |
US8622155B2 (en) | 2006-08-11 | 2014-01-07 | Schlumberger Technology Corporation | Pointed diamond working ends on a shear bit |
US7390066B2 (en) | 2006-08-11 | 2008-06-24 | Hall David R | Method for providing a degradation drum |
US7338135B1 (en) * | 2006-08-11 | 2008-03-04 | Hall David R | Holder for a degradation assembly |
US7992944B2 (en) * | 2006-08-11 | 2011-08-09 | Schlumberger Technology Corporation | Manually rotatable tool |
US7445294B2 (en) * | 2006-08-11 | 2008-11-04 | Hall David R | Attack tool |
US7384105B2 (en) * | 2006-08-11 | 2008-06-10 | Hall David R | Attack tool |
US20130341999A1 (en) * | 2006-08-11 | 2013-12-26 | David R. Hall | Attack Tool with an Interruption |
US8123302B2 (en) | 2006-08-11 | 2012-02-28 | Schlumberger Technology Corporation | Impact tool |
US8215420B2 (en) | 2006-08-11 | 2012-07-10 | Schlumberger Technology Corporation | Thermally stable pointed diamond with increased impact resistance |
US8590644B2 (en) | 2006-08-11 | 2013-11-26 | Schlumberger Technology Corporation | Downhole drill bit |
US7387345B2 (en) * | 2006-08-11 | 2008-06-17 | Hall David R | Lubricating drum |
US8500209B2 (en) * | 2006-08-11 | 2013-08-06 | Schlumberger Technology Corporation | Manually rotatable tool |
US8292372B2 (en) | 2007-12-21 | 2012-10-23 | Hall David R | Retention for holder shank |
US8033616B2 (en) * | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Braze thickness control |
US7669674B2 (en) | 2006-08-11 | 2010-03-02 | Hall David R | Degradation assembly |
US8714285B2 (en) | 2006-08-11 | 2014-05-06 | Schlumberger Technology Corporation | Method for drilling with a fixed bladed bit |
US9051795B2 (en) | 2006-08-11 | 2015-06-09 | Schlumberger Technology Corporation | Downhole drill bit |
US7997661B2 (en) * | 2006-08-11 | 2011-08-16 | Schlumberger Technology Corporation | Tapered bore in a pick |
US7320505B1 (en) | 2006-08-11 | 2008-01-22 | Hall David R | Attack tool |
US7871133B2 (en) * | 2006-08-11 | 2011-01-18 | Schlumberger Technology Corporation | Locking fixture |
US8201892B2 (en) * | 2006-08-11 | 2012-06-19 | Hall David R | Holder assembly |
US8007051B2 (en) * | 2006-08-11 | 2011-08-30 | Schlumberger Technology Corporation | Shank assembly |
US8567532B2 (en) | 2006-08-11 | 2013-10-29 | Schlumberger Technology Corporation | Cutting element attached to downhole fixed bladed bit at a positive rake angle |
US7744164B2 (en) * | 2006-08-11 | 2010-06-29 | Schluimberger Technology Corporation | Shield of a degradation assembly |
US7419224B2 (en) * | 2006-08-11 | 2008-09-02 | Hall David R | Sleeve in a degradation assembly |
US9145742B2 (en) | 2006-08-11 | 2015-09-29 | Schlumberger Technology Corporation | Pointed working ends on a drill bit |
US7469971B2 (en) | 2006-08-11 | 2008-12-30 | Hall David R | Lubricated pick |
US7396086B1 (en) | 2007-03-15 | 2008-07-08 | Hall David R | Press-fit pick |
US7963617B2 (en) | 2006-08-11 | 2011-06-21 | Schlumberger Technology Corporation | Degradation assembly |
US8449040B2 (en) | 2006-08-11 | 2013-05-28 | David R. Hall | Shank for an attack tool |
US7637574B2 (en) | 2006-08-11 | 2009-12-29 | Hall David R | Pick assembly |
US7464993B2 (en) * | 2006-08-11 | 2008-12-16 | Hall David R | Attack tool |
US8414085B2 (en) | 2006-08-11 | 2013-04-09 | Schlumberger Technology Corporation | Shank assembly with a tensioned element |
US8118371B2 (en) | 2006-08-11 | 2012-02-21 | Schlumberger Technology Corporation | Resilient pick shank |
US7992945B2 (en) * | 2006-08-11 | 2011-08-09 | Schlumberger Technology Corporation | Hollow pick shank |
US7600823B2 (en) * | 2006-08-11 | 2009-10-13 | Hall David R | Pick assembly |
US8960337B2 (en) | 2006-10-26 | 2015-02-24 | Schlumberger Technology Corporation | High impact resistant tool with an apex width between a first and second transitions |
US9068410B2 (en) | 2006-10-26 | 2015-06-30 | Schlumberger Technology Corporation | Dense diamond body |
US7976238B2 (en) * | 2006-12-01 | 2011-07-12 | Hall David R | End of a moldboard positioned proximate a milling drum |
US8485756B2 (en) * | 2006-12-01 | 2013-07-16 | David R. Hall | Heated liquid nozzles incorporated into a moldboard |
US8403595B2 (en) * | 2006-12-01 | 2013-03-26 | David R. Hall | Plurality of liquid jet nozzles and a blower mechanism that are directed into a milling chamber |
US9051794B2 (en) * | 2007-04-12 | 2015-06-09 | Schlumberger Technology Corporation | High impact shearing element |
US7594703B2 (en) * | 2007-05-14 | 2009-09-29 | Hall David R | Pick with a reentrant |
US7926883B2 (en) * | 2007-05-15 | 2011-04-19 | Schlumberger Technology Corporation | Spring loaded pick |
US8038223B2 (en) * | 2007-09-07 | 2011-10-18 | Schlumberger Technology Corporation | Pick with carbide cap |
US8210618B2 (en) * | 2007-08-23 | 2012-07-03 | Sandvik Intellectual Property Ab | Reduced volume cutting tip and cutter bit assembly incorporating same |
US8678517B2 (en) | 2007-08-23 | 2014-03-25 | Sandvik Intellectual Property Ab | Reduced volume cutting tip and cutting bit incorporating same |
US7832808B2 (en) | 2007-10-30 | 2010-11-16 | Hall David R | Tool holder sleeve |
US20110254349A1 (en) | 2007-12-21 | 2011-10-20 | Hall David R | Resilent Connection between a Pick Shank and Block |
US8540037B2 (en) | 2008-04-30 | 2013-09-24 | Schlumberger Technology Corporation | Layered polycrystalline diamond |
US7628233B1 (en) | 2008-07-23 | 2009-12-08 | Hall David R | Carbide bolster |
US8061457B2 (en) | 2009-02-17 | 2011-11-22 | Schlumberger Technology Corporation | Chamfered pointed enhanced diamond insert |
WO2010117765A1 (en) * | 2009-03-30 | 2010-10-14 | Schlumberger Canada Limited | Double sintered thermally stable polycrystalline diamond cutting elements |
US20100259092A1 (en) * | 2009-04-08 | 2010-10-14 | Adam Joseph Kelly | Rotatable Cutting Tool With Continuous Arcuate Head Portion |
US8322796B2 (en) * | 2009-04-16 | 2012-12-04 | Schlumberger Technology Corporation | Seal with contact element for pick shield |
US8701799B2 (en) * | 2009-04-29 | 2014-04-22 | Schlumberger Technology Corporation | Drill bit cutter pocket restitution |
US20100326740A1 (en) * | 2009-06-26 | 2010-12-30 | Hall David R | Bonded Assembly Having Low Residual Stress |
CN101876249B (zh) * | 2009-11-03 | 2012-05-23 | 武汉科技大学 | 一种金属陶瓷煤截齿的制备方法 |
US9028009B2 (en) | 2010-01-20 | 2015-05-12 | Element Six Gmbh | Pick tool and method for making same |
US8262168B2 (en) | 2010-09-22 | 2012-09-11 | Hall David R | Multiple milling drums secured to the underside of a single milling machine |
US8261471B2 (en) | 2010-06-30 | 2012-09-11 | Hall David R | Continuously adjusting resultant force in an excavating assembly |
US8449039B2 (en) | 2010-08-16 | 2013-05-28 | David R. Hall | Pick assembly with integrated piston |
CN102121383A (zh) * | 2010-10-17 | 2011-07-13 | 李仕清 | 一种高效截齿 |
US8728382B2 (en) | 2011-03-29 | 2014-05-20 | David R. Hall | Forming a polycrystalline ceramic in multiple sintering phases |
ES2436501T3 (es) * | 2011-06-28 | 2014-01-02 | Sandvik Intellectual Property Ab | Punta de corte y fresa de corte con mayores resistencia y capacidad de penetración |
US8668275B2 (en) | 2011-07-06 | 2014-03-11 | David R. Hall | Pick assembly with a contiguous spinal region |
EP2740884B1 (en) * | 2012-12-06 | 2015-02-25 | Sandvik Intellectual Property AB | Rock bit tip and rock bit |
CN103009001B (zh) * | 2012-12-20 | 2015-06-10 | 河南省煤科院耐磨技术有限公司 | 一种冷装配低截割阻力耐磨镐型截齿生产方法 |
WO2015072980A1 (en) * | 2013-11-13 | 2015-05-21 | Halliburton Energy Services, Inc. | Enhanced pcd cutter pocket surface geometry to improve attachment |
GB201901712D0 (en) | 2019-02-07 | 2019-03-27 | Element Six Gmbh | Pick tool for road milling |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US177973A (en) * | 1876-05-30 | Improvement in plow-points | ||
US1894101A (en) * | 1931-01-02 | 1933-01-10 | Gen Electric | Machine center |
US2614813A (en) * | 1949-07-08 | 1952-10-21 | Ingersoll Rand Co | Rock drilling tool |
US2628072A (en) * | 1949-09-01 | 1953-02-10 | Timken Roller Bearing Co | Drill bit having groove with hard metal cutter insert brazed therein |
US2707619A (en) * | 1950-06-22 | 1955-05-03 | Sandvikens Jernverks Ab | Percussion drills |
US2784943A (en) * | 1952-11-03 | 1957-03-12 | Sandvikens Jernverks Ab | Rock drill bit with cutting insert |
SU132160A1 (ru) * | 1960-03-04 | 1960-11-30 | Н.Р. Андерс | Твердосплавна пластинка дл инструмента, например горного, работающего в т желых услови х |
GB1089611A (en) * | 1964-01-10 | 1967-11-01 | Coal Industry Patents Ltd | Coal cutter picks |
US3519309A (en) * | 1965-08-12 | 1970-07-07 | Kennametal Inc | Rotary cone bit retained by captive keeper ring |
US3557416A (en) * | 1968-08-16 | 1971-01-26 | Kennametal Inc | Cutting insert |
SU402655A1 (ru) * | 1971-05-21 | 1973-10-19 | Струговый резец | |
SU605905A1 (ru) * | 1973-06-27 | 1978-05-05 | Украинский Институт Инженеров Водного Хозяйства | Способ прот гивани дренажных труб в кротовую дрену и устройство дл его осуществлени |
US4216832A (en) * | 1976-06-24 | 1980-08-12 | Kennametal Inc. | Furrowing tool |
SU605955A1 (ru) * | 1976-06-30 | 1978-05-05 | Всесоюзный Научно-Исследовательский И Проектный Институт Тугоплавких Металлов И Твердых Сплавов (Вниитс) | Твердосплавна пластинка дл горнорежущего инструмента |
US4150728A (en) * | 1976-11-26 | 1979-04-24 | Smith International, Inc. | Rock drill bit inserts with hollow bases |
ZA77339B (en) * | 1977-01-20 | 1978-04-26 | Boart Int Ltd | Brazing inserts |
SU751991A1 (ru) * | 1978-02-21 | 1980-07-30 | За витель | Резец дл горных машин |
US4176725A (en) * | 1978-08-17 | 1979-12-04 | Dresser Industries, Inc. | Earth boring cutting element enhanced retention system |
US4201421A (en) * | 1978-09-20 | 1980-05-06 | Besten Leroy E Den | Mining machine bit and mounting thereof |
DE2846744A1 (de) * | 1978-10-27 | 1980-04-30 | Wallram Hartmetall Gmbh | Schraempicke |
SU781341A1 (ru) * | 1979-01-03 | 1980-11-23 | Ордена Трудового Красного Знамени Институт Сверхтвердых Материалов Ан Украинской Сср | Резец дл горных машин |
SE450259C (sv) * | 1983-03-23 | 1996-07-04 | Sandvik Ab | Verktyg för brytning eller avverkning av fasta material, såsom asfalt |
US4497520A (en) * | 1983-04-29 | 1985-02-05 | Gte Products Corporation | Rotatable cutting bit |
US4547020A (en) * | 1983-05-09 | 1985-10-15 | Gte Products Corporation | Rotatable cutting bit |
SE436433B (sv) * | 1984-01-20 | 1984-12-10 | Santrade Ltd | Verktyg for brytning av fasta material |
-
1989
- 1989-01-27 US US07/303,510 patent/US4940288A/en not_active Expired - Lifetime
- 1989-07-13 JP JP1508639A patent/JPH03503430A/ja active Pending
- 1989-07-13 DE DE68920585T patent/DE68920585T2/de not_active Expired - Fee Related
- 1989-07-13 WO PCT/US1989/003036 patent/WO1990001106A1/en active IP Right Grant
- 1989-07-13 AT AT89909369T patent/ATE117049T1/de not_active IP Right Cessation
- 1989-07-13 EP EP89909369A patent/EP0428599B1/en not_active Expired - Lifetime
- 1989-07-13 AU AU40500/89A patent/AU617517B2/en not_active Ceased
- 1989-07-19 CA CA000606110A patent/CA1313382C/en not_active Expired - Fee Related
- 1989-07-20 ES ES8902576A patent/ES2015173A6/es not_active Expired - Lifetime
- 1989-07-20 PL PL89280685A patent/PL161730B1/pl unknown
- 1989-07-20 CN CN89104926A patent/CN1028662C/zh not_active Expired - Fee Related
-
1990
- 1990-02-12 KR KR1019900700280A patent/KR900702170A/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
PL161730B1 (pl) | 1993-07-30 |
AU617517B2 (en) | 1991-11-28 |
CN1028662C (zh) | 1995-05-31 |
AU4050089A (en) | 1990-02-19 |
CA1313382C (en) | 1993-02-02 |
CN1040247A (zh) | 1990-03-07 |
KR900702170A (ko) | 1990-12-06 |
DE68920585D1 (de) | 1995-02-23 |
JPH03503430A (ja) | 1991-08-01 |
US4940288A (en) | 1990-07-10 |
WO1990001106A1 (en) | 1990-02-08 |
ATE117049T1 (de) | 1995-01-15 |
DE68920585T2 (de) | 1995-05-24 |
EP0428599B1 (en) | 1995-01-11 |
EP0428599A4 (en) | 1991-10-23 |
EP0428599A1 (en) | 1991-05-29 |
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