| Patents for E21D 15 - Props; Chocks (3,432) |
|---|
| 05/19/1993 | CN1020780C Horizontal three plunger pump with forerumming type hydraulic controlled in side unloading |
| 05/12/1993 | CN1071994A Hydraulic support of steelwork mine |
| 05/12/1993 | CN1071993A Combined end hydraulic support |
| 05/05/1993 | CN2131979Y Wedge-type fastener for expansible metal rack composed of i-steel |
| 04/28/1993 | CN2130920Y Plane closed manometer for hydraulic props of coal mines |
| 04/28/1993 | CN2130919Y Combined hydraulic supporting device for mines |
| 04/27/1993 | US5205676 Hydraulic steel mine prop |
| 04/21/1993 | CN2130208Y Props cap of mine props |
| 04/14/1993 | CN2129825Y Moveable lengthening device for single body hydraulic strut of coal working surface |
| 04/14/1993 | CN1070981A Simple integrative mining hydraulic support |
| 04/07/1993 | CN2129343Y Automatic recording-alarming instrument for mine pressure |
| 04/07/1993 | CN2129342Y Expender of en-block hydraulic strut |
| 03/31/1993 | CN1070449A Mining prop shoe made from anti-electrostatic fire retardant compound material |
| 03/24/1993 | CN2128671Y Pressure maintaining priming gun |
| 03/24/1993 | CN2128670Y GS material gallery filling end hydraulic chock |
| 03/17/1993 | CN2128308Y Caving or network laying hydraulic chock |
| 03/04/1993 | DE4129171A1 Flexible segmental tubular supports for tunnel construction - are connected by modular joints to form polygon frame filled subsequently with building material |
| 02/24/1993 | CN2127430Y Oil water emulsion hydraulic lift winch |
| 01/28/1993 | DE4124328A1 telescopic hollow support prop with filler valve - comprises two steel tubes one inside other forming common void for filling with concrete |
| 01/20/1993 | CN1068168A Hydraulic prop of mechanically laying and connecting network |
| 01/07/1993 | DE4120789C1 Mine roof support with floor carried base body - which is box-shaped for retaining expanding, reactive mixt. for filling hollow support |
| 12/30/1992 | CN1067479A Hydraulic props with moving roof beam |
| 12/30/1992 | CN1067478A Shielded hydraulic props for step-by-step movement |
| 12/23/1992 | CN2125704U Fork type hydraulic lifting unit |
| 12/09/1992 | CN2124308U "clamp plate-pull rod" assembling type metal chock for trapezoidal gallery |
| 12/02/1992 | CN2123606U Test instrument for underground emulsion |
| 11/24/1992 | US5165824 Elongated shoring device |
| 11/11/1992 | WO1992020903A1 Shaft lining support |
| 11/11/1992 | CN2121537U Valve controlled hydraulic gun |
| 11/11/1992 | CN2121536U Repaired telescopic prop of single hydraulic prop |
| 11/11/1992 | CA2086530A1 Support column |
| 11/03/1992 | US5159872 Valve units for use in hydraulic control systems of mining equipment |
| 10/28/1992 | CN2120179U Prop seat for mining |
| 10/21/1992 | CN2119502U Combined single hydraulic prop device |
| 10/07/1992 | CN2118159U Pressure display for chock and prop of comprehensive exploitation |
| 10/07/1992 | CN2118158U Aluminium alloy hydraulic single prop |
| 09/30/1992 | CN2117467U Movable sealing head |
| 09/30/1992 | CN2117466U Large space-length hydraulic props |
| 09/23/1992 | CN2116779U Tunnelling hydraulic support with anchoring-bolts hole mechanism |
| 09/22/1992 | US5149228 Prop preloading apparatus |
| 09/16/1992 | CN2116089U Withdrawing props winch |
| 09/16/1992 | CN2116088U En-block hydraulic prop manometer |
| 09/16/1992 | CN2116087U Extendible mine en-block hydraulic prop |
| 09/02/1992 | CN2114700U Detachable length extension device for mine single hydraulic prop |
| 09/01/1992 | US5143484 Mine cribbing device and method |
| 09/01/1992 | US5143340 Load support |
| 09/01/1992 | CA1306874C Method and an apparatus for producing lining for slender supporting structural units |
| 08/26/1992 | CN2114153U Portable dynameter |
| 08/26/1992 | CN2114029U New-type single hydraulic prop |
| 08/19/1992 | CN2113343U Hydraulic chock valve controller |
| 08/12/1992 | CN2112691U Power accumulation pressure increasing single post shoe |
| 08/12/1992 | CN2112690U Light anti-static post shoe and cap |
| 08/05/1992 | CN2112007U Self-control pressure priming gun |
| 08/05/1992 | CN2112006U Single hydraulic prop stabilizer |
| 07/29/1992 | CN2111364U Two-way expanding support |
| 07/29/1992 | CN2111285U Coal mine support traction tank car steel cable vertical roll |
| 07/23/1992 | CA2059575A1 Yieldable roof support system |
| 07/15/1992 | CN2110084U U-shap steel cable |
| 07/08/1992 | CN2109444U H steel ladder shape support for mine use |
| 07/01/1992 | EP0491882A1 Multi-height hydraulic pit prop. |
| 07/01/1992 | CN2108797U Hydraulic prop tripurpose valve assembling implements for mine |
| 06/24/1992 | CN2108175U Telescopic interlocking device for protecting tunnel chocks from toppling-down |
| 06/24/1992 | CN2108174U Hydraulic prop resistance recorder |
| 06/17/1992 | CN2107533U Prop end cap |
| 06/17/1992 | CN2107532U Adjustable single hydraulic prop linking device |
| 06/17/1992 | CN2107531U Sounding hydraulic gun |
| 06/10/1992 | CN1061829A Full section hydraulic support with internal and external beam lift strut |
| 05/27/1992 | CN2105557U Mine tunnel supporting and protecting device |
| 05/13/1992 | CN2104296U Combined hydraulic support for end head |
| 05/06/1992 | CN2103639U Mobile stay-pole for drifting face |
| 05/06/1992 | CN1060888A Repairing method for single hydraulic prop hollow axial accesories and its device |
| 04/29/1992 | EP0482141A1 Hydraulic steel pit prop. |
| 04/29/1992 | EP0482140A1 Process for manufacturing a piston-cylinder unit and a piston-cylinder unit manufactured by said process |
| 04/29/1992 | CN2103005U Assembly post shoes for mine |
| 04/29/1992 | CN2103004U Outer injection single hydraulic pressure support |
| 04/22/1992 | CN2102371U Synthetic material pressure plate pole shoe of coal mine single strut |
| 04/15/1992 | CN2101761U Single body hydraulic prop self unloading machine |
| 04/15/1992 | CN2101760U Intelligent tester for testing working resistance of hydraulic prop |
| 04/15/1992 | CN2101759U Containerized turnover frame with single body hydraulic prop |
| 04/15/1992 | CN2101758U Flexible pull rod device |
| 04/15/1992 | CN2101757U Multifunctional liquid pouring gun for closed line |
| 04/15/1992 | CN2101756U Capsule type supporting device |
| 04/15/1992 | CN2101755U Hinged chock |
| 04/15/1992 | CN2101754U Single hydraulic prop |
| 04/08/1992 | CN2101111U Pressure increasing measuring gun for single body hydraulic prop |
| 04/08/1992 | CN2101110U Joint for h-steel extendible support frame |
| 04/08/1992 | CN2101109U Strong steel support frame |
| 04/08/1992 | CN1016212B Pressure limited valve with dry chamer including spring |
| 04/02/1992 | DE4030386A1 Valve for hydraulic extendable pit props - has tough plastics seating with spring loaded spindle in metal sleeve |
| 04/01/1992 | CN2100485U Hydraulic aperture reducing machine |
| 03/18/1992 | CN2099195U Automatic proportional emulsified-oil adder for emulsion tank |
| 03/18/1992 | CN2099194U Anticorrosive and impaction-resisting round prop |
| 03/18/1992 | CN2099193U Double-clip consolidating fall preventer for inclined u-steel prop |
| 03/18/1992 | CN2099192U Double-clip fall preventer for inclined prop |
| 03/18/1992 | CN2099191U Integrated hydraulic prop with built-in prop head |
| 03/11/1992 | CN2098554U Double-column hydraulic prop with high working resistance |
| 03/11/1992 | CN1059390A Walking-type hydraulic supporting frame |
| 03/04/1992 | EP0472545A1 Flexible telescopic prop for building materials. |
| 02/19/1992 | EP0471145A1 Length-adjustable telescopic hydraulic mine prop |
| 02/19/1992 | CN2096642U Prop dismounting machine for single hydraulic prop |