| Patents for E21C 35 - Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups , or (6,127) |
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| 11/06/1991 | CN2088166U Coal-stopping device for explosive mining and mechanical loading |
| 10/22/1991 | CA1291250C Method for remote control of a coal shearer |
| 10/22/1991 | CA1291246C Modular automatic controller, preferably programmable, in particular for mining plant |
| 10/08/1991 | US5055092 Driving systems for driving endless chains or the like in mining apparatus |
| 10/08/1991 | US5054858 Selectively phased water supply of a cutter head |
| 10/01/1991 | US5052757 Flighting section and tooth holder |
| 09/12/1991 | DE4007347A1 Cutting tool for coal cutting machine - is retained in tool holder pocket by curved member with concentric surfaces |
| 09/11/1991 | CN1013891B Cutter bit and tip |
| 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 |
| 08/28/1991 | CN2083629U Harrow coal charging machine |
| 08/20/1991 | US5040850 Tool supporting structure for use in material removing machines |
| 08/06/1991 | CA2035627A1 Miner cutting bit holding apparatus |
| 08/01/1991 | DE4002303A1 Electric motor and associated gears |
| 07/25/1991 | WO1991010807A1 Cutting bit to prevent deformation of socket mount |
| 07/17/1991 | EP0414751A4 Bit assembly utilizing carbide insert |
| 07/17/1991 | CN1053102A Dedusting equipment for coal stope |
| 07/11/1991 | DE4000316A1 Coal cutter with adjustable conveyor - has adjustment performed by second hydraulic cylinder |
| 07/11/1991 | DE4000050A1 Tool for rock cutting or crushing machine - is retained in tool holder by two half rings which are held together by spring ring |
| 07/10/1991 | CA2033858A1 Cutting bit |
| 07/09/1991 | US5029944 Device for releasable mounting tools in mining machines |
| 07/09/1991 | US5029943 Apparatus for transmitting data |
| 06/14/1991 | CA2031620A1 Rotary cutting head |
| 06/12/1991 | CN2078799U Automatic proportioning charger for oil water emulsion |
| 06/04/1991 | US5020860 Methods and apparatus for maintaining longwall face alignment |
| 05/28/1991 | US5018793 Rotationally and axially movable bit |
| 05/22/1991 | EP0427758A1 Cemented carbide tip |
| 05/08/1991 | EP0425552A1 Cutter bit and tip. |
| 05/08/1991 | CN1051224A Minig machine, in particular cutting tool for coal planing machine |
| 05/07/1991 | US5013093 Universal ripper miner |
| 04/30/1991 | US5011229 Miner cutting bit holding apparatus |
| 04/27/1991 | CA2028361A1 Cutter bit assemblies and arrangements for use with mining or tunnelling machines |
| 04/16/1991 | US5007685 Trenching tool assembly with dual indexing capability |
| 04/16/1991 | US5007684 Water spray unit for mining |
| 04/04/1991 | DE3931838A1 Cutting tool set for coal mining machine - is mounted in tool holder fitted with detachable protective cap with gap for tool |
| 03/26/1991 | WO1991004392A1 Process and device for controlling longwall shearing and heading machines along a cutting horizon between coal and rock |
| 03/26/1991 | CA2042368A1 Process and device for controlling longwall shearing and heading machines along a cutting horizon between coal and rock |
| 03/13/1991 | CN1011995B Hard alloy cutter bit |
| 03/12/1991 | US4998778 Mining tool including a chisel and a chisel holder |
| 03/07/1991 | WO1991002884A1 Rotatable cutting tool |
| 03/06/1991 | EP0414751A1 Bit assembly utilizing carbide insert. |
| 03/06/1991 | CN1011904B Method for remote control of coal shearer |
| 02/28/1991 | DE3927515A1 Hydraulic-pneumatic pump for open cast mining equipment - has central piece releasably connected to side pieces having connection conduits |
| 02/27/1991 | EP0413917A1 Conical rotating cutting tool with wear shield bearing surface |
| 02/27/1991 | CN1011803B Dipper teeth of digging machine |
| 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 |
| 02/13/1991 | EP0412287A2 Pick or similar tool for the extraction of raw materials or the recycling |
| 02/12/1991 | US4992657 Apparatus for detecting the cutting horizon for mining machines |
| 01/22/1991 | CA1279336C Cutter bit having hard tip with middle section defined by concave surface of revolution |
| 01/16/1991 | CN1011265B Modular automatic controller, preferably programmable, in particular for mining plant |
| 01/01/1991 | US4981328 Rotatable tool having a carbide insert with bumps |
| 01/01/1991 | US4981327 Method and apparatus for sensing coal-rock interface |
| 01/01/1991 | US4980980 Tooth for a digging bucket of an excavator |
| 12/25/1990 | US4980681 Direct view remote control method for workings machine and transmitter and receiver assembly for carrying out such method |
| 12/20/1990 | DE4018035A1 Verfahren und vorrichtung zur uebertragung von daten Method and apparatus for transmitting data |
| 12/20/1990 | DE3919432A1 Covered cable duct housing supply lines - is open sided and has provision for further supply lines at right angles to initial ones |
| 12/18/1990 | USRE33494 Pick holding arrangements |
| 12/18/1990 | US4978173 Tooth holder |
| 12/11/1990 | US4976496 Valve openable in response to displacement of a cutting tool |
| 12/11/1990 | US4976495 Method and apparatus for steering a mining machine cutter |
| 11/29/1990 | WO1990012949A3 Method and apparatus for increasing the efficiency of highwall mining |
| 11/29/1990 | DE3916069C1 Water-cooled cutting chisel - moves axially and actuates valve controlling supply of cooling water |
| 11/28/1990 | EP0399221A2 Mining pick |
| 11/23/1990 | CA2013346A1 Mining pick |
| 11/22/1990 | DE4015917A1 Hobel-gewinnungsvorrichtung fuer unterirdische bergmaennische schneid- oder abbauarbeiten Planing recovery device for underground mining cut- or decommissioning |
| 11/22/1990 | DE4015022A1 Cutting tool for coal cutting machine - has transverse groove in shank to receive retaining wedge |
| 11/15/1990 | DE3920556C1 Digging machine pick holder - incorporates base with socket space normal to pick axis |
| 11/15/1990 | DE3915722A1 Drill for prodn. of large hole - has sliding tapering bolt forming self-locking clamp for interchangeable tool shank |
| 11/06/1990 | US4968978 Long range multiple point wireless control and monitoring system |
| 11/06/1990 | US4968098 Coal seam discontinuity sensor and method for coal mining apparatus |
| 11/01/1990 | WO1990012949A2 Method and apparatus for increasing the efficiency of highwall mining |
| 10/31/1990 | EP0395610A2 Tool for cutting solid material |
| 10/31/1990 | EP0395608A2 Tool for cutting solid material |
| 10/30/1990 | US4966417 Device for guying a drift advancing machine within a drift |
| 10/25/1990 | DE3913121A1 Machinery to control level of coal plough blade - includes chain guide linked to console by several hydraulic cylinders |
| 10/18/1990 | DE3910914A1 Apparatus for controlling the cutting depth of coal ploughs |
| 10/03/1990 | EP0389482A1 Chisel bit arrangement |
| 10/03/1990 | CN1045837A Method for remote control of coal shearer |
| 09/20/1990 | DE3908075A1 Device for intrinsically safe DC-isolated signal transmission in shearer loaders |
| 09/19/1990 | CN1045439A Cutting pick with high-hard antiwear coating and technology thereof |
| 09/07/1990 | WO1990010140A1 Device for manipulation control of a movable object |
| 09/05/1990 | CN2061606U Stoping loading machine for small coal mine |
| 09/04/1990 | US4953915 Roof fall separating and removing apparatus and method for use in thin seam highwall mining |
| 08/28/1990 | US4952001 Mining bit preload retainer |
| 08/28/1990 | US4952000 Method and apparatus for increasing the efficiency of highwall mining |
| 08/23/1990 | DE3909425C1 Holder for picks for machines for excavating mineral substances |
| 08/16/1990 | DE3904279A1 Shearer loader with self-reaming holder for sensors scanning the cutting horizon |
| 07/31/1990 | US4944560 Miner cutting bit holding apparatus |
| 07/31/1990 | US4944559 Tool for a mine working machine comprising a diamond-charged abrasive component |
| 07/26/1990 | WO1990008246A1 Trenching tool assembly with dual indexing capability |
| 07/18/1990 | EP0377585A1 Annular shim for construction bit having multiple perforations for stress relief |
| 07/17/1990 | US4941711 Cemented carbide tip |
| 07/10/1990 | US4940288 Earth engaging cutter bit |
| 07/03/1990 | US4938538 Excavating tool cutting insert |
| 06/28/1990 | WO1990007033A1 Bit assembly utilizing carbide insert |
| 06/26/1990 | US4936632 Continuous miner with duct assembly |
| 06/19/1990 | US4934757 Control of mineral mining machines |
| 06/16/1990 | CA2000859A1 Ground engaging bit having a hardened tip |
| 06/12/1990 | US4932723 Cutting-bit holding support block shield |
| 06/07/1990 | DE3902222C1 Cutter-pick arrangement |