| Patents for E21C 27 - Machines which completely free the mineral from the seam (1,602) |
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| 10/08/1991 | US5054858 Selectively phased water supply of a cutter head |
| 09/26/1991 | DE4009237A1 Lower loader for longwall working - has auxiliary roller to pulverise coarse debris to prevent blockage in machine gantry |
| 08/29/1991 | DE4004489A1 Loosening and winning seams of coal - involves machine with articulated side guide links to bridge ends of profiled guides and inner guide members |
| 08/01/1991 | DE4002303A1 Electric motor and associated gears |
| 07/02/1991 | US5028092 Impact kerfing rock cutter and method |
| 05/29/1991 | EP0429051A1 Drum shearer |
| 05/08/1991 | CN1051224A Minig machine, in particular cutting tool for coal planing machine |
| 05/07/1991 | US5013093 Universal ripper miner |
| 04/27/1991 | CA2028361A1 Cutter bit assemblies and arrangements for use with mining or tunnelling machines |
| 04/25/1991 | DE3935162A1 Plough drive on chain drag conveyor - has box with access opening for sprocket and baffle changing |
| 04/25/1991 | DE3935036A1 Plough for coal mixing - has detachable tools supported by articulated skid connected to body by tongue=and=groove joints |
| 03/26/1991 | US5002341 Mining apparatus for mechinized breaking-down of mineral materials, particularly coal, in underground mining operations |
| 03/20/1991 | CN1012093B Walking hydraulic impulsive coal cutter |
| 02/28/1991 | DE3927515A1 Hydraulic-pneumatic pump for open cast mining equipment - has central piece releasably connected to side pieces having connection conduits |
| 02/21/1991 | DE3927285A1 Plough or chisel for mining machine - is fixed by bolt driven into holder at angle wedging chisel shaft tightly |
| 02/14/1991 | DE3925813A1 Coal plough chain guide - includes sliding distance piece drilled to accept threaded plug into which fixing bolt screws |
| 02/07/1991 | DE3925672A1 Device for mounting top bracket on chain drag conveyor - comprises drawer runners fixed to head surface with nut and bolt fixing |
| 02/05/1991 | CA1279865C Percussive tool with high pressure fluid jet |
| 01/31/1991 | DE3923969A1 Coal plough with grader - has swivel mounting for chisel holder |
| 01/09/1991 | CN1048427A Apparatus for directional destorying entire sturdy objects |
| 12/20/1990 | DE3919672A1 Drum cutting machine on mobile conveyor - has additional drum vertically mounted on free end of jib |
| 11/22/1990 | EP0397858A1 Apparatus for forming slit in base rock and concrete surface |
| 10/18/1990 | WO1990011871A1 Impact kerfing rock cutter and method |
| 10/18/1990 | DE3910914A1 Apparatus for controlling the cutting depth of coal ploughs |
| 10/03/1990 | EP0389482A1 Chisel bit arrangement |
| 10/02/1990 | US4960306 Open-cut mining cutter |
| 09/11/1990 | US4955668 Drum cutter-loader equipped with an auxiliary drum |
| 09/04/1990 | US4953915 Roof fall separating and removing apparatus and method for use in thin seam highwall mining |
| 09/04/1990 | US4953914 Mining machine with roof bolting apparatus |
| 07/31/1990 | US4944558 Drum cutter-loader for underground mining |
| 07/26/1990 | DE3901596A1 Pick arrangement for a coal plough |
| 07/24/1990 | US4943120 Force transmitting housing for longwall mining machine |
| 06/21/1990 | DE3153684C2 Mine mineral cutting sword plane |
| 06/19/1990 | US4934757 Control of mineral mining machines |
| 06/06/1990 | CN1008288B Removing apparatus of guiding with protective hydraulic props |
| 05/31/1990 | DE3839613A1 Shearer loader fitted with cutting drums mounted on pivotable supporting arms |
| 05/23/1990 | EP0368887A1 Selectively phased water supply of a cutter head. |
| 05/23/1990 | DE3838862A1 Walzenlader Shearer |
| 05/10/1990 | DE3837521A1 Coal plough with internal generation of pressure |
| 05/01/1990 | US4921309 Mining machine adapted for attachment of continuous miner cutter boom assembly |
| 05/01/1990 | US4921307 Mining apparatus for mechanized breaking-down of mineral materials, particularly coal, in underground mining operations |
| 04/11/1990 | EP0362455A1 Chisel arrangement |
| 03/29/1990 | DE3931282A1 Control system for coal cutting machine - has array of thrust rams coupled to dosing pumps and control valves |
| 03/22/1990 | WO1990002865A1 Chisel bit arrangement |
| 03/01/1990 | DE3829225A1 Shearer loader |
| 03/01/1990 | DE3828942A1 Pick arrangement for a winning plough |
| 02/22/1990 | DE3926957A1 Coal cutting plant with cutter and scraper chain conveyor - has cutting distance measurement unit with sensors assigned to cutter unit and electronic evaluation unit |
| 02/22/1990 | DE3828371A1 Baseplate plough |
| 12/26/1989 | US4889392 Advance/retreat cutting miner and method |
| 12/20/1989 | CN1006163B Mining plough apparatus |
| 12/19/1989 | US4887991 Drive assemblies for chain-driven mining machinery |
| 12/19/1989 | US4887868 Dual auger continuous mining machine |
| 12/19/1989 | US4887867 Ranging drum shearers |
| 12/07/1989 | DE3817763A1 Shearer loader for underground mining |
| 11/28/1989 | US4883323 Longwall mining machine for the mining of thick mineral seams |
| 11/28/1989 | US4883322 Mining and conveying apparatus |
| 11/23/1989 | DE3816506A1 Shearer loader which is equipped with an additional drum rotatably mounted on a pivotable supporting arm and arranged above the face conveyor |
| 11/16/1989 | DE3810374C1 Double-drum shearer |
| 11/09/1989 | DE3814197A1 Winning apparatus for underground mining, in particular for potash extraction |
| 11/02/1989 | DE3813195A1 Plough system for underground winning operations |
| 10/17/1989 | CA1262368A1 Continuous mining machine |
| 10/11/1989 | EP0150210B1 Continuous mining machine |
| 10/05/1989 | DE3810399A1 Support apparatus with vertically pivotable cutting arm |
| 09/26/1989 | CA1261888A1 Open-cut-mining milling unit |
| 09/14/1989 | DE3806659A1 Shearer loader with two hydraulic winches |
| 09/12/1989 | US4865390 Continuous mining machine with roof supporting apparatus and method for anchoring crossbeam supports |
| 08/29/1989 | US4861111 Mining cutter-loader for winning minerals |
| 08/22/1989 | US4858701 Fluid-powered impact device and tool therefor |
| 08/22/1989 | US4858347 Continuous excavating apparatus and methods |
| 07/27/1989 | WO1989006741A1 Apparatus for forming slit in base rock and concrete surface |
| 07/27/1989 | WO1989006586A1 Fluid-powered impact device and tool therefor |
| 07/12/1989 | CN1033860A Mining machine |
| 07/12/1989 | CN1033859A Walking hydraulic impulsive coal cutter |
| 05/31/1989 | EP0318285A1 Mining machine |
| 05/11/1989 | DE3735596A1 Shearer loader with vertically adjustable cutting drums mounted on supporting arms |
| 05/09/1989 | US4828326 Shearer loader for underground mining operation |
| 05/03/1989 | EP0314263A1 Mining method and apparatus |
| 04/18/1989 | US4822105 Double ended ranging drum shearer and method of controlling working height in mining face in use of the same |
| 04/05/1989 | CN1032213A Ranging drum shearers |
| 03/21/1989 | US4813749 Pilot operated stepping directional valve and method for single line operation |
| 03/15/1989 | EP0307213A1 Ranging drum shearers |
| 03/09/1989 | DE3729089A1 Shearer loader equipped with pivotable supporting arms for underground operation |
| 03/09/1989 | DE3729088A1 Shearer loader or selective-cut heading machine for underground operation |
| 03/01/1989 | EP0304421A1 Open-cut mining cutter. |
| 02/08/1989 | CN1030960A 采掘机 Mining machine |
| 01/26/1989 | DE3720869C1 Threadless tie rod for shearer loaders |
| 01/19/1989 | DE3722211A1 Plough system for underground mining |
| 01/12/1989 | WO1989000236A1 Selectively phased water supply of a cutter head |
| 12/22/1988 | DE3718478A1 Coal-winning unit for a steep dip |
| 12/01/1988 | DE3716668C1 Mit einer Winde ausgeruesteter Walzenlader des Untertagebetriebes Using a jack equipped shearer of underground operation |
| 11/15/1988 | US4784439 Movable cutting machine |
| 10/20/1988 | DE3710925A1 Plough system with baseplate plough |
| 10/18/1988 | US4778221 Movable device for openpit mining |
| 10/11/1988 | US4776637 Cutting machines and method of controlling the cutting horizon |
| 09/22/1988 | WO1988007124A1 Process for drilling minerals |
| 09/15/1988 | DE3806363A1 Pick arrangement |
| 09/08/1988 | DE3705254A1 Additional roller for a roller loader |
| 09/06/1988 | US4768836 Coal shaver |
| 08/09/1988 | US4762372 Cutter-bit assemblies |
| 06/28/1988 | US4753486 Mining machine with roof bolting apparatus |