| Patents for E21D 17 - Caps for supporting mine roofs (547) |
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| 02/07/2001 | CN2418253Y Awning-proping top beam of high polymer |
| 12/13/2000 | CN2410420Y Wedge bidirectional fixed end supporting cap device |
| 11/14/2000 | US6146056 Channel and bearing plate assembly |
| 06/21/2000 | CN2383978Y Big section metallic telescopic supporter hinged auxiliary beam |
| 05/31/2000 | CN1053030C Self-advancing shielding structure of combined slide protection plate |
| 02/16/2000 | CN1049386C Glass steel-magnesite concrete compounded support material for mining well |
| 08/25/1999 | CN2334874Y Double horizontal wedge metal acticulated cap |
| 05/06/1998 | CN2280775Y Backtimber section steel for mine |
| 04/29/1998 | CN2280156Y Combination and sliding type cap for supporting mine roof |
| 04/22/1998 | CN2279445Y Double-wedge twisted joint back timber |
| 02/18/1998 | CN2274690Y Supporting beam for removing props |
| 11/11/1997 | US5685669 Mining roof support |
| 08/13/1997 | CN2259489Y Connecting structure for metal articulated roof bar girder body and joint |
| 06/18/1997 | CN2256467Y Hydraulic hinged jacking beam |
| 04/09/1997 | CN1147055A Combined self-advancing shield of sliding retaining-plate |
| 12/07/1996 | CA2178383A1 Headboard |
| 09/18/1996 | CN2235505Y Combination type sliding retaining-plate automatic advanced shield drifting machine |
| 08/21/1996 | CN2233459Y Cam angle-regulating mining metal hinged cap |
| 05/29/1996 | CN2228131Y Connecting component of segmented chock cap for coal face |
| 04/03/1996 | CN2223780Y Multi-function retaining-plate |
| 02/28/1996 | CN2221100Y Tunnel bearer shed |
| 11/29/1995 | CN2213846Y Underwater tunnel bridge member |
| 11/22/1995 | CN2213232Y Mining hinged top beam nylon backing deals |
| 04/26/1995 | CN2195619Y Cross cap for supporting mine roof |
| 10/19/1994 | CN2179910Y Metal articulated cap |
| 06/29/1994 | CN2170373Y Swinging tail beam type hydraulic support for blasting down roof of coal mine |
| 05/25/1994 | CN2166230Y V-shape short beam |
| 04/13/1994 | CN2161729Y Hydraulic articulated cap |
| 04/13/1994 | CN2161726Y Hydraulic prop |
| 03/23/1994 | CN2159453Y Hydraulic hinged top beam |
| 02/15/1994 | CA1326961C Articulated steel cap for underground timbering |
| 01/26/1994 | CN2154350Y Anti-fall callipers for frame stretch-forward beam |
| 12/22/1993 | CN2150335Y Bracket for supporting roof beam |
| 09/29/1993 | CN2142883Y Temporary supporter for drifting flexible bar |
| 09/22/1993 | CN2142498Y Hydraulic frame for inclined coal layer |
| 09/15/1993 | CN1076248A Maintaining soft rock gallery by top pressure relief method |
| 08/25/1993 | CN2140957Y Mine cap device of reinforced concrete support |
| 07/14/1993 | CN2138192Y Flexible anchor pin with expansible shell |
| 06/23/1993 | CN1073500A Glass steel-magnesite concrete compounded support material for mining well |
| 06/16/1993 | CN2136329Y Wedge structural beam |
| 05/05/1993 | CN2131980Y Rubber pad with u-steel frame |
| 04/21/1993 | CN2130209Y Retainer for pit arch props |
| 03/10/1993 | CN2127957Y Double-pin position limited joint for mineral join top beam |
| 02/24/1993 | CN1019937C Double-locating type cable band and its mfg. method |
| 01/06/1993 | CN1067706A Hydraulic arch support for soft-rock tunnel |
| 11/18/1992 | CN2122234U Mine high strength bayonet chain ring |
| 11/04/1992 | CN2120879U Multifunction soft combined metal mark |
| 10/28/1992 | CN2120180U Chain link type cantilever |
| 09/30/1992 | CN2117468U Long metal double hinged beam |
| 09/02/1992 | CN2114701U End hanging top beam |
| 08/19/1992 | CN2113344U Dual angle modulation wedge net shape cap for supporting mine roof |
| 08/12/1992 | CN2112692U Hinged top beam |
| 07/29/1992 | CN2111364U Two-way expanding support |
| 07/22/1992 | CN2110712U Cap sliding enclosing rock supporting frame |
| 04/15/1992 | CN2101762U H shaped steel shack fall-proof device for mine |
| 04/08/1992 | CN2101112U Flexible rigid pin connection roof beam |
| 04/01/1992 | CN2100486U Cantilever extension protector for underground driving working faces |
| 03/18/1992 | CN2099197U Compound bamboo fibre backboard for mine |
| 03/18/1992 | CN2099196U Articulated rigid metal cap in stope |
| 02/12/1992 | CN2095935U H-bar dual direction retractive lane support wedge joint |
| 01/22/1992 | CN2093902U Mine plate of magnesite concrete |
| 01/08/1992 | CN1057698A Front beam direction controller for bolt-sprayed tunnel |
| 12/11/1991 | CN2090419U Three-beam and waste rock bumping structure combined light hydraulic prop |
| 11/13/1991 | CN2088600U Mining field roof plate support and protect device |
| 11/13/1991 | CN2088599U Cross-shaped double-wedge hinged roof beam |
| 10/09/1991 | EP0319546B1 Section for the shoring of mines and tunnels |
| 10/09/1991 | CN2086303U Moving beam pliers |
| 09/25/1991 | CN2085417U High strength light type nylon cap |
| 09/04/1991 | CN2084103U Fastener for supporting mine roofbeam |
| 08/21/1991 | CN2083194U New-type articulated cap for mining |
| 08/14/1991 | DE4003865A1 Support lining for mining roadways or longwall faces - comprises narrow steel strap with connecting eyes at each end for coupling to other straps |
| 07/17/1991 | CN2080988U Fixing device for front cantilever |
| 07/10/1991 | CN2080559U Clamp for u-steel prop of pit |
| 07/10/1991 | CN1013136B Roofbeam joined with steel of support for underground mining |
| 06/19/1991 | CN2079217U Reinforced fibreglass back board |
| 06/12/1991 | CN2078806U Inserted metal backing deals |
| 06/12/1991 | CN2078805U Cap-setting machine |
| 06/05/1991 | CN2078371U Simple support for long beam |
| 04/03/1991 | CN2074364U Slip cap with forward turning over cantilever |
| 03/06/1991 | CN2072592U Anchor spray tunnel cantilevel beam direction adjuster |
| 02/20/1991 | CN1049393A Double-locating type cable band and its moulding process |
| 02/13/1991 | CN1011605B Hydraulic prop for moving suspended top beam |
| 01/16/1991 | CN2069482U Supporting frame of anchor truss |
| 01/16/1991 | CN2069481U Net-coupling type hydraulic supporting frame |
| 01/02/1991 | CN2068583U Movable hydraulic chock moving along roof |
| 12/26/1990 | CN2068150U Body lap jointed type metal backing deals |
| 12/26/1990 | CN2068149U Wheelspin type front stretching beam |
| 08/01/1990 | CN2059939U Digital alarm for monitoring mine roof |
| 05/16/1990 | CN2057214U Angle-adjusting wedging device for metal hinged top-beam |
| 05/02/1990 | CN2056698U Plain end grove concrete back plate |
| 04/11/1990 | CN2055864U Combined spring |
| 02/14/1990 | CN1039638A Hydraulic prop for moving suspended top beam |
| 11/21/1989 | US4881853 Support section for mines and tunnels |
| 11/16/1989 | DE3824395C1 Device for shifting support sections, designed as I-shaped box sections and free of external straps, in mine and tunnel support free of bracing and props |
| 09/06/1989 | EP0331618A2 Method for manufacturing a steel section, and its use and section |
| 08/23/1989 | CN2043274U New type coupling piece for t-steel retractable tunnel supporting frame |
| 08/02/1989 | CN2042110U Articulated matallic top beam |
| 07/27/1989 | DE3803941C1 Bar shield for the face support in collieries |
| 07/20/1989 | DE3800275A1 Connection for hollow sections, in particular box sections for mine and tunnel support |
| 07/05/1989 | CN2040539U Articulated stretch-forward beam for tunnelled working surface |