GB2004315A - Tool for cutting rocks and minerals. - Google Patents
Tool for cutting rocks and minerals.Info
- Publication number
- GB2004315A GB2004315A GB7836742A GB7836742A GB2004315A GB 2004315 A GB2004315 A GB 2004315A GB 7836742 A GB7836742 A GB 7836742A GB 7836742 A GB7836742 A GB 7836742A GB 2004315 A GB2004315 A GB 2004315A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tool
- minerals
- cutting rocks
- hard metal
- rocks
- 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.)
- Pending
Links
- 239000011435 rock Substances 0.000 title abstract 2
- 229910052500 inorganic mineral Inorganic materials 0.000 title 1
- 239000011707 mineral Substances 0.000 title 1
- 239000002184 metal Substances 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
Classifications
-
- 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
- E21C35/1835—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)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Earth Drilling (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Walking Sticks, Umbrellas, And Fans (AREA)
Abstract
A rock cutting tool comprising a steel shaft 1a having an end portion 1b which tapers towards the end of the shaft and contains a hard metal pin 3, the said portion being surrounded by a ring 5 of hard metal. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772741894 DE2741894A1 (en) | 1977-09-17 | 1977-09-17 | TOOL FOR REMOVING ROCKS AND MINERALS |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2004315A true GB2004315A (en) | 1979-03-28 |
Family
ID=6019188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7836742A Pending GB2004315A (en) | 1977-09-17 | 1978-09-14 | Tool for cutting rocks and minerals. |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2741894A1 (en) |
FR (1) | FR2403447A1 (en) |
GB (1) | GB2004315A (en) |
SE (1) | SE7809331L (en) |
Cited By (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4277106A (en) * | 1979-10-22 | 1981-07-07 | Syndrill Carbide Diamond Company | Self renewing working tip mining pick |
US4725098A (en) * | 1986-12-19 | 1988-02-16 | Kennametal Inc. | Erosion resistant cutting bit with hardfacing |
US5417475A (en) * | 1992-08-19 | 1995-05-23 | Sandvik Ab | Tool comprised of a holder body and a hard insert and method of using same |
US5541006A (en) * | 1994-12-23 | 1996-07-30 | Kennametal Inc. | Method of making composite cermet articles and the articles |
US5677042A (en) * | 1994-12-23 | 1997-10-14 | Kennametal Inc. | Composite cermet articles and method of making |
US5686119A (en) * | 1994-12-23 | 1997-11-11 | Kennametal Inc. | Composite cermet articles and method of making |
US5823632A (en) * | 1996-06-13 | 1998-10-20 | Burkett; Kenneth H. | Self-sharpening nosepiece with skirt for attack tools |
US5837071A (en) * | 1993-11-03 | 1998-11-17 | Sandvik Ab | Diamond coated cutting tool insert and method of making same |
US6164728A (en) * | 1998-07-24 | 2000-12-26 | The Sollami Company | Tool mounting assembly with tungsten carbide insert |
US6357832B1 (en) | 1998-07-24 | 2002-03-19 | The Sollami Company | Tool mounting assembly with tungsten carbide insert |
US6709065B2 (en) | 2002-01-30 | 2004-03-23 | Sandvik Ab | Rotary cutting bit with material-deflecting ledge |
US6908688B1 (en) | 2000-08-04 | 2005-06-21 | Kennametal Inc. | Graded composite hardmetals |
US7204560B2 (en) * | 2003-08-15 | 2007-04-17 | Sandvik Intellectual Property Ab | Rotary cutting bit with material-deflecting ledge |
US7530642B2 (en) | 2006-12-15 | 2009-05-12 | Kennametal Inc. | Cutting bit with split wear ring and method of making same |
US7712693B2 (en) | 2006-08-11 | 2010-05-11 | Hall David R | Degradation insert with overhang |
US7717365B2 (en) | 2006-08-11 | 2010-05-18 | Hall David R | Degradation insert with overhang |
US7740414B2 (en) | 2005-03-01 | 2010-06-22 | Hall David R | Milling apparatus for a paved surface |
US7926883B2 (en) | 2007-05-15 | 2011-04-19 | Schlumberger Technology Corporation | Spring loaded pick |
US7946657B2 (en) | 2006-08-11 | 2011-05-24 | Schlumberger Technology Corporation | Retention for an insert |
US7950746B2 (en) | 2006-06-16 | 2011-05-31 | Schlumberger Technology Corporation | Attack tool for degrading materials |
US7992944B2 (en) | 2006-08-11 | 2011-08-09 | Schlumberger Technology Corporation | Manually rotatable tool |
US7992945B2 (en) | 2006-08-11 | 2011-08-09 | Schlumberger Technology Corporation | Hollow pick shank |
US7997661B2 (en) | 2006-08-11 | 2011-08-16 | Schlumberger Technology Corporation | Tapered bore in a pick |
US8007049B2 (en) | 2007-12-05 | 2011-08-30 | Sandvik Intellectual Property Ab | Breaking or excavating tool with cemented tungsten carbide insert and ring |
US8007051B2 (en) | 2006-08-11 | 2011-08-30 | Schlumberger Technology Corporation | Shank assembly |
US8007050B2 (en) | 2006-08-11 | 2011-08-30 | Schlumberger Technology Corporation | Degradation assembly |
US8028774B2 (en) | 2006-10-26 | 2011-10-04 | Schlumberger Technology Corporation | Thick pointed superhard material |
US8033616B2 (en) | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Braze thickness control |
US8033615B2 (en) | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Retention system |
US8038223B2 (en) | 2007-09-07 | 2011-10-18 | Schlumberger Technology Corporation | Pick with carbide cap |
US8061457B2 (en) | 2009-02-17 | 2011-11-22 | Schlumberger Technology Corporation | Chamfered pointed enhanced diamond insert |
US8118371B2 (en) | 2006-08-11 | 2012-02-21 | Schlumberger Technology Corporation | Resilient pick shank |
US8201892B2 (en) | 2006-08-11 | 2012-06-19 | Hall David R | Holder assembly |
US8215420B2 (en) | 2006-08-11 | 2012-07-10 | Schlumberger Technology Corporation | Thermally stable pointed diamond with increased impact resistance |
US8250786B2 (en) | 2010-06-30 | 2012-08-28 | Hall David R | Measuring mechanism in a bore hole of a pointed cutting element |
US8292372B2 (en) | 2007-12-21 | 2012-10-23 | Hall David R | Retention for holder shank |
US8322796B2 (en) | 2009-04-16 | 2012-12-04 | Schlumberger Technology Corporation | Seal with contact element for pick shield |
US8414085B2 (en) | 2006-08-11 | 2013-04-09 | Schlumberger Technology Corporation | Shank assembly with a tensioned element |
US8449040B2 (en) | 2006-08-11 | 2013-05-28 | David R. Hall | Shank for an attack tool |
US8453497B2 (en) | 2006-08-11 | 2013-06-04 | Schlumberger Technology Corporation | Test fixture that positions a cutting element at a positive rake angle |
US8485609B2 (en) | 2006-08-11 | 2013-07-16 | Schlumberger Technology Corporation | Impact tool |
US8500209B2 (en) | 2006-08-11 | 2013-08-06 | Schlumberger Technology Corporation | Manually rotatable tool |
US8540037B2 (en) | 2008-04-30 | 2013-09-24 | Schlumberger Technology Corporation | Layered polycrystalline diamond |
US8567532B2 (en) | 2006-08-11 | 2013-10-29 | Schlumberger Technology Corporation | Cutting element attached to downhole fixed bladed bit at a positive rake angle |
US8590644B2 (en) | 2006-08-11 | 2013-11-26 | Schlumberger Technology Corporation | Downhole drill bit |
US8646848B2 (en) | 2007-12-21 | 2014-02-11 | David R. Hall | Resilient connection between a pick shank and block |
US8668275B2 (en) | 2011-07-06 | 2014-03-11 | David R. Hall | Pick assembly with a contiguous spinal region |
US8701799B2 (en) | 2009-04-29 | 2014-04-22 | Schlumberger Technology Corporation | Drill bit cutter pocket restitution |
US8714285B2 (en) | 2006-08-11 | 2014-05-06 | Schlumberger Technology Corporation | Method for drilling with a fixed bladed bit |
US8777326B2 (en) | 2012-01-23 | 2014-07-15 | David R. Hall | Pick with hardened core assembly |
US9051795B2 (en) | 2006-08-11 | 2015-06-09 | Schlumberger Technology Corporation | Downhole drill bit |
US9051794B2 (en) | 2007-04-12 | 2015-06-09 | Schlumberger Technology Corporation | High impact shearing element |
US9068410B2 (en) | 2006-10-26 | 2015-06-30 | Schlumberger Technology Corporation | Dense diamond body |
US9366089B2 (en) | 2006-08-11 | 2016-06-14 | Schlumberger Technology Corporation | Cutting element attached to downhole fixed bladed bit at a positive rake angle |
US10029391B2 (en) | 2006-10-26 | 2018-07-24 | Schlumberger Technology Corporation | High impact resistant tool with an apex width between a first and second transitions |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3334268A1 (en) * | 1983-09-22 | 1985-04-11 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Pick for a winning machine working with a ploughing action, in particular a coal plough |
DE3500931A1 (en) * | 1984-01-31 | 1985-08-08 | De Beers Industrial Diamond Division (Proprietary) Ltd., Johannesburg, Transvaal | CUTTING TOOL |
RU2442894C1 (en) * | 2010-10-22 | 2012-02-20 | Николай Митрофанович Панин | Cutter for mining machinery |
RU2452857C1 (en) * | 2010-10-22 | 2012-06-10 | Николай Митрофанович Панин | Cutter for mining machines (versions) |
-
1977
- 1977-09-17 DE DE19772741894 patent/DE2741894A1/en not_active Withdrawn
-
1978
- 1978-09-05 SE SE7809331A patent/SE7809331L/en unknown
- 1978-09-11 FR FR7825985A patent/FR2403447A1/en not_active Withdrawn
- 1978-09-14 GB GB7836742A patent/GB2004315A/en active Pending
Cited By (84)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4277106A (en) * | 1979-10-22 | 1981-07-07 | Syndrill Carbide Diamond Company | Self renewing working tip mining pick |
US4725098A (en) * | 1986-12-19 | 1988-02-16 | Kennametal Inc. | Erosion resistant cutting bit with hardfacing |
JPS63165688A (en) * | 1986-12-19 | 1988-07-08 | ケンナメタル インコーポレイテツド | Corrosion-resistant cutting chisel on which surface hardening is executed |
EP0274645A1 (en) * | 1986-12-19 | 1988-07-20 | Kennametal Inc. | Erosion resistant cutting bit with hardfacing |
JPH0663414B2 (en) | 1986-12-19 | 1994-08-22 | ケンナメタル インコーポレイテツド | Cutting bit |
US5417475A (en) * | 1992-08-19 | 1995-05-23 | Sandvik Ab | Tool comprised of a holder body and a hard insert and method of using same |
US5837071A (en) * | 1993-11-03 | 1998-11-17 | Sandvik Ab | Diamond coated cutting tool insert and method of making same |
US6051079A (en) * | 1993-11-03 | 2000-04-18 | Sandvik Ab | Diamond coated cutting tool insert |
US5792403A (en) * | 1994-12-23 | 1998-08-11 | Kennametal Inc. | Method of molding green bodies |
US5679445A (en) * | 1994-12-23 | 1997-10-21 | Kennametal Inc. | Composite cermet articles and method of making |
US5697046A (en) * | 1994-12-23 | 1997-12-09 | Kennametal Inc. | Composite cermet articles and method of making |
US5697042A (en) * | 1994-12-23 | 1997-12-09 | Kennametal Inc. | Composite cermet articles and method of making |
US5762843A (en) * | 1994-12-23 | 1998-06-09 | Kennametal Inc. | Method of making composite cermet articles |
US5789686A (en) * | 1994-12-23 | 1998-08-04 | Kennametal Inc. | Composite cermet articles and method of making |
US5541006A (en) * | 1994-12-23 | 1996-07-30 | Kennametal Inc. | Method of making composite cermet articles and the articles |
US5806934A (en) * | 1994-12-23 | 1998-09-15 | Kennametal Inc. | Method of using composite cermet articles |
US5677042A (en) * | 1994-12-23 | 1997-10-14 | Kennametal Inc. | Composite cermet articles and method of making |
US5686119A (en) * | 1994-12-23 | 1997-11-11 | Kennametal Inc. | Composite cermet articles and method of making |
US5823632A (en) * | 1996-06-13 | 1998-10-20 | Burkett; Kenneth H. | Self-sharpening nosepiece with skirt for attack tools |
US6164728A (en) * | 1998-07-24 | 2000-12-26 | The Sollami Company | Tool mounting assembly with tungsten carbide insert |
US6357832B1 (en) | 1998-07-24 | 2002-03-19 | The Sollami Company | Tool mounting assembly with tungsten carbide insert |
US6908688B1 (en) | 2000-08-04 | 2005-06-21 | Kennametal Inc. | Graded composite hardmetals |
US6709065B2 (en) | 2002-01-30 | 2004-03-23 | Sandvik Ab | Rotary cutting bit with material-deflecting ledge |
US7204560B2 (en) * | 2003-08-15 | 2007-04-17 | Sandvik Intellectual Property Ab | Rotary cutting bit with material-deflecting ledge |
EP1543217B1 (en) * | 2003-08-15 | 2007-11-14 | Sandvik Intellectual Property AB | Rotary cutting bit with material-deflecting ledge |
CN1701161B (en) * | 2003-08-15 | 2012-11-14 | 山特维克知识产权股份有限公司 | Rotary cutting bit with material-deflecting ledge |
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 |
US8033616B2 (en) | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Braze thickness control |
US8567532B2 (en) | 2006-08-11 | 2013-10-29 | Schlumberger Technology Corporation | Cutting element attached to downhole fixed bladed bit at a positive rake angle |
US7946657B2 (en) | 2006-08-11 | 2011-05-24 | Schlumberger Technology Corporation | Retention for an insert |
US7946656B2 (en) | 2006-08-11 | 2011-05-24 | Schlumberger Technology Corporation | Retention system |
US7717365B2 (en) | 2006-08-11 | 2010-05-18 | Hall David R | Degradation insert with overhang |
US7963617B2 (en) | 2006-08-11 | 2011-06-21 | Schlumberger Technology Corporation | Degradation assembly |
US7992944B2 (en) | 2006-08-11 | 2011-08-09 | Schlumberger Technology Corporation | Manually rotatable tool |
US7992945B2 (en) | 2006-08-11 | 2011-08-09 | Schlumberger Technology Corporation | Hollow pick shank |
US7997661B2 (en) | 2006-08-11 | 2011-08-16 | Schlumberger Technology Corporation | Tapered bore in a pick |
US10378288B2 (en) | 2006-08-11 | 2019-08-13 | Schlumberger Technology Corporation | Downhole drill bit incorporating cutting elements of different geometries |
US8007051B2 (en) | 2006-08-11 | 2011-08-30 | Schlumberger Technology Corporation | Shank assembly |
US8007050B2 (en) | 2006-08-11 | 2011-08-30 | Schlumberger Technology Corporation | Degradation assembly |
US9708856B2 (en) | 2006-08-11 | 2017-07-18 | Smith International, Inc. | Downhole drill bit |
US8029068B2 (en) | 2006-08-11 | 2011-10-04 | Schlumberger Technology Corporation | Locking fixture for a degradation assembly |
US9366089B2 (en) | 2006-08-11 | 2016-06-14 | Schlumberger Technology Corporation | Cutting element attached to downhole fixed bladed bit at a positive rake angle |
US7712693B2 (en) | 2006-08-11 | 2010-05-11 | Hall David R | Degradation insert with overhang |
US8033615B2 (en) | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Retention system |
US9051795B2 (en) | 2006-08-11 | 2015-06-09 | Schlumberger Technology Corporation | Downhole drill bit |
US8714285B2 (en) | 2006-08-11 | 2014-05-06 | Schlumberger Technology Corporation | Method for drilling with a fixed bladed bit |
US8061784B2 (en) | 2006-08-11 | 2011-11-22 | Schlumberger Technology Corporation | Retention system |
US8590644B2 (en) | 2006-08-11 | 2013-11-26 | Schlumberger Technology Corporation | Downhole drill bit |
US8118371B2 (en) | 2006-08-11 | 2012-02-21 | Schlumberger Technology Corporation | Resilient pick shank |
US8123302B2 (en) | 2006-08-11 | 2012-02-28 | Schlumberger Technology Corporation | Impact tool |
US8201892B2 (en) | 2006-08-11 | 2012-06-19 | Hall David R | Holder assembly |
US8215420B2 (en) | 2006-08-11 | 2012-07-10 | Schlumberger Technology Corporation | Thermally stable pointed diamond with increased impact resistance |
US8534767B2 (en) | 2006-08-11 | 2013-09-17 | David R. Hall | Manually rotatable tool |
US8500209B2 (en) | 2006-08-11 | 2013-08-06 | Schlumberger Technology Corporation | Manually rotatable tool |
US8500210B2 (en) | 2006-08-11 | 2013-08-06 | Schlumberger Technology Corporation | Resilient pick shank |
US8485609B2 (en) | 2006-08-11 | 2013-07-16 | Schlumberger Technology Corporation | Impact tool |
US8453497B2 (en) | 2006-08-11 | 2013-06-04 | Schlumberger Technology Corporation | Test fixture that positions a cutting element at a positive rake angle |
US8414085B2 (en) | 2006-08-11 | 2013-04-09 | Schlumberger Technology Corporation | Shank assembly with a tensioned element |
US8434573B2 (en) | 2006-08-11 | 2013-05-07 | Schlumberger Technology Corporation | Degradation assembly |
US8449040B2 (en) | 2006-08-11 | 2013-05-28 | David R. Hall | Shank for an attack tool |
US8454096B2 (en) | 2006-08-11 | 2013-06-04 | Schlumberger Technology Corporation | High-impact resistant tool |
US9068410B2 (en) | 2006-10-26 | 2015-06-30 | Schlumberger Technology Corporation | Dense diamond body |
US9540886B2 (en) | 2006-10-26 | 2017-01-10 | Schlumberger Technology Corporation | Thick pointed superhard material |
US8028774B2 (en) | 2006-10-26 | 2011-10-04 | Schlumberger Technology Corporation | Thick pointed superhard material |
US8109349B2 (en) | 2006-10-26 | 2012-02-07 | Schlumberger Technology Corporation | Thick pointed superhard material |
US10029391B2 (en) | 2006-10-26 | 2018-07-24 | Schlumberger Technology Corporation | High impact resistant tool with an apex width between a first and second transitions |
US7530642B2 (en) | 2006-12-15 | 2009-05-12 | Kennametal Inc. | Cutting bit with split wear ring and method of making same |
US9051794B2 (en) | 2007-04-12 | 2015-06-09 | Schlumberger Technology Corporation | High impact shearing element |
US8342611B2 (en) | 2007-05-15 | 2013-01-01 | Schlumberger Technology Corporation | Spring loaded pick |
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 |
CN101889127B (en) * | 2007-12-05 | 2013-06-05 | 山特维克知识产权股份有限公司 | Breaking or excavating tool with cemented tungsten carbide insert and ring, material removing machine incorporating such a tool and method of manufacturing such a tool |
US8007048B2 (en) | 2007-12-05 | 2011-08-30 | Sandvik Intellectual Property Ab | Breaking or excavating tool with cemented tungsten carbide insert and ring |
US8007049B2 (en) | 2007-12-05 | 2011-08-30 | Sandvik Intellectual Property Ab | Breaking or excavating tool with cemented tungsten carbide insert and ring |
US8292372B2 (en) | 2007-12-21 | 2012-10-23 | Hall David R | Retention for holder shank |
US8646848B2 (en) | 2007-12-21 | 2014-02-11 | David R. Hall | Resilient connection between a pick shank and block |
US8540037B2 (en) | 2008-04-30 | 2013-09-24 | Schlumberger Technology Corporation | Layered polycrystalline diamond |
US8061457B2 (en) | 2009-02-17 | 2011-11-22 | Schlumberger Technology Corporation | Chamfered pointed enhanced diamond insert |
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 |
US8250786B2 (en) | 2010-06-30 | 2012-08-28 | Hall David R | Measuring mechanism in a bore hole of a pointed cutting element |
US8668275B2 (en) | 2011-07-06 | 2014-03-11 | David R. Hall | Pick assembly with a contiguous spinal region |
US8777326B2 (en) | 2012-01-23 | 2014-07-15 | David R. Hall | Pick with hardened core assembly |
Also Published As
Publication number | Publication date |
---|---|
SE7809331L (en) | 1979-03-18 |
DE2741894A1 (en) | 1979-03-29 |
FR2403447A1 (en) | 1979-04-13 |
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