| Patents for E21C 25 - Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (2,629) |
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| 04/12/1988 | US4736987 Rock cutting assembly |
| 04/12/1988 | US4736808 Percussive tool with high pressure fluid jet |
| 04/12/1988 | CA1235151A1 Rotary rock and trench cutting saw |
| 04/07/1988 | DE3627205C1 Hydraulic self-advancing support assembly in combination with a winning apparatus circulating at the roof and floor |
| 04/05/1988 | US4735458 Device for intermittently subjecting axially shiftable bits of a cutting head to the action of pressurized fluids |
| 03/24/1988 | DE3631266A1 Winning apparatus guided on hydraulic self-advancing support assemblies |
| 03/22/1988 | US4732224 Auger apparatus |
| 03/16/1988 | CN86209735U Grooving sampling device |
| 03/16/1988 | CN86207329U Coal cutter of high pressure water-jet flow vertical swing vibration |
| 03/10/1988 | WO1988001559A1 Chain saw |
| 02/11/1988 | DE3633361C1 Shearer drum for underground mining |
| 02/09/1988 | CA1232621A1 Process and apparatus for cutting rock |
| 02/04/1988 | DE3625111A1 Rake-blade mounting for roller loaders of underground mining |
| 01/12/1988 | US4718731 Used for excavation work |
| 01/12/1988 | US4718730 Cross-axis cutting assembly of a selective cutting machine |
| 01/05/1988 | US4717205 Cutter |
| 12/17/1987 | DE3619578A1 Cutting head for advance working machines |
| 12/08/1987 | CA1230134A1 Hydraulic monitor protection apparatus |
| 12/01/1987 | CA1229853A1 Process for spraying the bits and/or facing with pressurized liquid as well as apparatus for performing this process |
| 11/24/1987 | US4708214 Rotatable end deflector for abrasive water jet drill |
| 10/15/1987 | DE3611446A1 Drum-shaped cutting body for a shearing machine |
| 10/06/1987 | US4697850 Cutter drum for pavement profiler |
| 10/01/1987 | DE3610015A1 Boring device for making boreholes |
| 09/15/1987 | US4693517 Cutter for gouging ore or rock from mine faces |
| 09/02/1987 | CN86208957U Water turbine reducer |
| 08/26/1987 | CN86102321A Internally adjustable multiple-bucket coal cutter |
| 08/04/1987 | US4683684 High pressure fluid jet apparatus for cutting and removing pavement |
| 07/29/1987 | CN86100272A Tractor of combined cutter-loader |
| 07/22/1987 | EP0229238A1 Mining tool for winning minerals, particularly coal |
| 07/21/1987 | US4681264 Enhancing liquid jet erosion |
| 07/02/1987 | DE3614196C1 Combined cutting tool for a heading machine |
| 06/23/1987 | US4674803 Endless chains comprised of interdigitated link elements having an H-shaped configuration |
| 06/11/1987 | DE3543016A1 Interchangeable winning tool |
| 06/03/1987 | EP0223896A2 Cutter chain link of a shearing chain |
| 05/13/1987 | EP0221881A1 Method of monitoring the charge and/or the cooling of bits and device for carrying out the method |
| 05/13/1987 | EP0221731A1 High pressure fluid jet apparatus for cutting and removing pavement |
| 05/12/1987 | US4663893 End deflector for abrasive water jet slot cutter |
| 05/05/1987 | US4662684 Rotary rock and trench cutting saw |
| 04/28/1987 | US4660891 High pressure water valve |
| 03/31/1987 | US4653810 Pre-bolting system for underground mines |
| 03/05/1987 | DE3616170A1 Device for monitoring the rate of wear of picks of a cutter head |
| 03/03/1987 | CA1218680A1 Bucketwheel excavator |
| 02/26/1987 | DE3527779C1 Shearer drum for underground mining |
| 02/24/1987 | CA1218388A1 Mobile mining machine and method |
| 02/17/1987 | US4643483 Fluid supply system to rotary cutter heads on mining machines |
| 02/10/1987 | CA1217785A Pivot mechanism for sod cutting machine |
| 01/22/1987 | DE3527786C1 Cowl holder for a shearer drum |
| 01/07/1987 | EP0207232A1 Cutting apparatus for an excavating machine |
| 12/02/1986 | US4625815 Drilling equipment, especially for use in underground mining |
| 11/26/1986 | EP0202478A1 Cutting head of a heading machine |
| 11/25/1986 | US4624326 Process and apparatus for cutting rock |
| 11/04/1986 | US4620748 Method of and arrangement for loosening, loading and transporting of stratified minerals in underground elongated front longwalls |
| 10/29/1986 | EP0199712A2 Device for the intermittent feeding of axially shiftable picks of a cutter head with pressure fluids |
| 09/24/1986 | EP0195347A2 Cutting head of a winning or driving machine |
| 09/24/1986 | CN85102526A Hard rock drilling method and bead-string drilling device |
| 09/10/1986 | EP0194039A1 Manipulative device |
| 08/27/1986 | CN86101283A Manipulative device |
| 08/26/1986 | CA1210414A1 Enhancing liquid jet erosion |
| 08/14/1986 | WO1986004537A1 Manipulative device |
| 04/29/1986 | US4585275 Process for spraying the bits and/or the facing with pressurized liquid as well as apparatus for performing this process |
| 04/08/1986 | US4580725 Hydraulic monitor protection apparatus |
| 03/04/1986 | US4573743 Bucketwheel excavator with oscillating nozzles |
| 02/25/1986 | US4572303 Machine for extracting, rough shaping and squaring blocks of stones, marbles and granites, particularly in quarries |
| 02/12/1986 | EP0171375A1 High pressure water valve |
| 02/04/1986 | US4568128 Rotary cutter heads for mineral mining machines |
| 01/22/1986 | EP0168553A1 Method and apparatus for cutting rock |
| 12/31/1985 | CA1198748A1 Stationary drill string hydraulic mining tool apparatus |
| 12/18/1985 | EP0164371A1 Mobile mining machine and method |
| 11/27/1985 | EP0162729A2 Rotary rock and trench-cutting saw |
| 10/22/1985 | US4548442 Mobile mining machine and method |
| 08/20/1985 | US4536035 Hydraulic mining method |
| 08/06/1985 | CA1191514A1 Cutting drum |
| 06/20/1985 | WO1985002653A1 Mobile mining machine and method |
| 06/05/1985 | EP0143110A1 Coal cutting drum blade with support at the coal side |
| 04/23/1985 | US4512612 System for mounting tooth-carrier sectors on a cutter wheel or a milling-cutter drum |
| 01/29/1985 | US4495716 Apparatus for harvesting peat |
| 01/29/1985 | CA1181773A1 Method of and apparatus for cutting peat |
| 01/23/1985 | EP0131771A1 Drilling device, especially for underground mining |
| 01/22/1985 | CA1181439A1 Reciprocably supported dual-drive member and features |
| 01/22/1985 | CA1181438A1 Method of and apparatus for hydraulic mining |
| 01/01/1985 | US4491370 For a winning machine |
| 11/06/1984 | US4480873 Flighting section and tooth holder |
| 10/17/1984 | EP0122252A2 Method of sprinkling bits and/or working-faces by means of a pressurized fluid, and device for carrying out the method |
| 10/02/1984 | US4474251 Enhancing liquid jet erosion |
| 09/18/1984 | US4471998 Cutter drum assembly for longwall mining machines |
| 09/18/1984 | US4471997 Method for depositing dust during hydraulicking of minerals by a cutter roller of a mining machine |
| 09/18/1984 | CA1174700A1 Pulse hydraulic monitor |
| 09/11/1984 | US4470636 Mining machine excavator drum having liquid spray control |
| 08/21/1984 | CA1173068A1 Cutting roller |
| 08/14/1984 | US4465320 Cutter drum assembly for longwall mining machines |
| 08/07/1984 | CA1172273A1 Cutter bit holder |
| 06/12/1984 | CA1169104A1 Tools and tool holders |
| 06/12/1984 | CA1169103A1 Spiral vane shearer drum |
| 05/29/1984 | US4451092 Cutting roller |
| 05/01/1984 | US4445724 Cutter-loader apparatus having overhung shearer drum |
| 04/17/1984 | CA1165783A1 Cutting roller for a mining machine |
| 03/27/1984 | US4438821 Mining machinery |
| 03/20/1984 | US4437708 Cutting devices for mining and tunnelling machines |
| 03/13/1984 | US4436346 Cutting roller for a mining machine |
| 03/07/1984 | EP0102303A2 Method of affixing pick holders to a cutting wheel or a milling drum |