| Patents for E21D 17 - Caps for supporting mine roofs (547) |
|---|
| 06/21/1989 | CN2039742U End dual-wedge articulated cap for stope of coal mine |
| 06/14/1989 | EP0319546A1 Section for the shoring of mines and tunnels. |
| 04/11/1989 | US4820085 Articulating steel cap for underground mining support structures |
| 04/05/1989 | CN2035384U Net-shaped articulated cap |
| 03/15/1989 | CN2034197U Slide long beam and support beam clamp device for mining |
| 03/08/1989 | CN2033857U Suspensory displaceable hydraulic prop for headbeam |
| 02/22/1989 | CN2033055U Flexible backing deals for coal face |
| 11/09/1988 | CN88201675U Flexible back plate of splice roof beam for coal face |
| 11/02/1988 | CN87213540U Supporting clamp for shifting beam |
| 10/05/1988 | CN87216591U Cotter pin type fall-proof apparatus for tunnelling face strut support |
| 10/05/1988 | CN86208161U Protecting apparatus for oil pumping rod |
| 09/07/1988 | CN88203818U Sliding hydraulic prop with double carrying bar |
| 07/06/1988 | EP0273122A1 Articulated steel cap for a mining support |
| 06/29/1988 | CN87108117A Roofbeam joined with steel of support for underground mining |
| 06/01/1988 | CN87208215U Double-arch type convenient for disassembly articulated cap |
| 05/11/1988 | CN87210952U Metal roof-supporting beam with transverse articulated struction |
| 04/14/1988 | DE3634252A1 Wedge trough fishplate |
| 04/06/1988 | CN87210527U Metal hinged cap |
| 03/10/1988 | WO1988001680A1 Section for the shoring of mines and tunnels |
| 11/04/1987 | CN87202633U Auricular wedge type connecting parts and its mounting device |
| 07/29/1987 | CN86100268A Cap of mine's support |
| 07/22/1987 | CN86203899U Ear-holding type jointer |
| 03/12/1987 | DE3530482A1 Stringer for the forepoling of the roadway support in underground working |
| 02/25/1987 | CN86203699U Metal cross top beam |
| 02/24/1987 | US4645819 Non-crosslinked polyether-ketones which can be processed by a thermoplastic method, and their preparation |
| 11/26/1986 | CN85104044A Extensible top beam |
| 05/14/1986 | CN85202365U Slipping cross beam hydraulic supports |
| 05/14/1986 | CN85201482U Work face metal pile cat for generally exploiting coal mine |
| 10/22/1985 | US4548527 Roof support suitable for use in mines |
| 09/12/1984 | EP0117900A2 Hinged cap for an underground support |
| 09/12/1984 | EP0117893A2 Hinged cap for an underground support |
| 09/05/1984 | EP0117439A2 Cross cap |
| 06/05/1984 | CA1168459A1 Mine roof plate beam for a roof truss assembly |
| 05/22/1984 | US4449860 Mine roof supports |
| 05/08/1984 | US4447174 Cap positioning mechanism |
| 10/26/1983 | EP0091980A2 Safety-cap bracket |
| 05/12/1981 | US4266892 Hydraulic roof-support frame |
| 12/02/1980 | CA1090596A1 Prestressed elastic arched mine roof support |
| 11/04/1980 | US4231672 Heavy duty adjustable prop with a ball-and-socket joint |
| 04/15/1980 | CA1075480A1 Mine roof supports |
| 03/27/1979 | US4146349 Mine roof support method and apparatus |
| 11/14/1978 | US4124984 Mine roof supports |
| 11/07/1978 | CA1041778A1 Mining equipment |
| 09/12/1978 | CA1038175A1 Teles-copic mine prop cap |
| 06/20/1978 | US4095432 Mine roof supports |
| 01/25/1977 | US4004771 Ball-and-socket type connections for use with mining apparatus |
| 11/16/1976 | US3991577 Telescopic support caps, e.g. for use in mining |