| Patents for E21C 25 - Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (2,629) |
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| 02/01/1984 | EP0099791A2 Equipment for extraction of stone,marble or granite,especially from quarries and for roughing and squaring it |
| 01/31/1984 | US4428619 Rotary cutter heads for mining machines |
| 01/17/1984 | CA1160648A1 Mining cutting drum and method of laying dust |
| 12/21/1983 | EP0096585A1 An earth working machine |
| 10/25/1983 | US4411475 Cutting drum |
| 09/27/1983 | US4406500 Cutting assembly including expanding wall segments of auger |
| 07/19/1983 | US4394053 Nozzle holder for cutter drum in longwall mining machinery |
| 06/21/1983 | US4389073 Apparatus for use with cutting drums of mineral machines |
| 06/21/1983 | US4389071 Enhancing liquid jet erosion |
| 05/10/1983 | CA1146183A1 Tool fastening |
| 05/04/1983 | EP0078041A2 Cutter chain for a stone cutting machine |
| 03/08/1983 | US4375904 Longwall mineral winning machine with adjustable cutting jet |
| 02/03/1983 | WO1983000357A1 A method of and apparatus for hydraulic mining |
| 02/01/1983 | US4371210 Freely rotatable pick bit holder on rotary driven member and method |
| 01/26/1983 | EP0070506A2 Cutter-jib of a cutting machine |
| 01/18/1983 | US4368925 Cutter drum assembly for a longwall mining machine |
| 11/09/1982 | US4358161 Mining equipment |
| 10/13/1982 | EP0062111A2 Enhancing liquid jet erosion |
| 08/31/1982 | US4346939 Cowl assembly for longwall mining machine |
| 08/03/1982 | US4342486 Cutter bit holder |
| 05/11/1982 | US4328996 Cutter drum support arm for longwall mining machine |
| 04/20/1982 | CA1122234A1 Tools for mineral winning machines |
| 04/06/1982 | CA1121393A1 Hydromechanical device with cutting and breaking heads, for recovery of mineral materials |
| 02/16/1982 | CA1118459A1 Process of and an arrangement for mining |
| 01/12/1982 | US4310199 Cutter drum assembly for a continuous mining machine |
| 12/15/1981 | CA1114405A1 Method and device for breaking hard compact material such as rock |
| 12/01/1981 | US4303277 Triangular shaped cutting head for use with a longwall mining machine |
| 11/10/1981 | CA1112255A1 Arrangement for discharging liquid medium under high pressure |
| 10/27/1981 | CA1111455A1 Mining equipment |
| 10/06/1981 | CA1110283A1 Method and apparatus for mining minerals, especially coal formations |
| 09/15/1981 | US4289275 Method and device for breaking a hard compact material |
| 07/28/1981 | US4280735 Non-rotary mining cutter with recessed nozzle insert |
| 07/21/1981 | CA1105504A1 Means for driving the back walls of a bucket excavator |
| 07/14/1981 | US4278296 Coal mining drum with adjustable linier edge cutters |
| 07/07/1981 | US4277105 Conveyor system for a continuous mining machine |
| 06/16/1981 | US4273383 Mineral winning machines |
| 06/09/1981 | CA1102828A1 Mining unit of coal combines |
| 05/19/1981 | US4268089 Mounting means for pick on mining drum vane |
| 05/12/1981 | US4266830 Auger construction providing reduced noise |
| 05/05/1981 | US4265487 High pressure water jet mining machine |
| 05/05/1981 | CA1100555A1 Method of making high velocity liquid jet |
| 03/31/1981 | US4258957 Cutting machine nose shoe |
| 03/17/1981 | CA1097700A2 Low profile mining machine |
| 03/10/1981 | US4254995 Process of and an arrangement for mining |
| 03/03/1981 | US4253705 Continuous mining machine having a boom member with a fixed material dislodging means |
| 02/17/1981 | US4251112 Apparatus for pivotally positioning a clearing shield for a drum-cutter mining machine |
| 02/17/1981 | US4251110 Mineral mining installation |
| 02/10/1981 | US4249779 Rotating cutting drum having tapered and curved conveying surface |
| 02/10/1981 | CA1095542A1 Apparatus for cutting hard earth formations |
| 02/03/1981 | CA1095093A1 Method and device for breaking a hard compact material |
| 01/13/1981 | US4244626 Rotary cutter for gouging out ore from mine faces or the like |
| 01/13/1981 | US4244625 Apparatus for cutting hard earth formations |
| 01/13/1981 | US4244521 Arrangement for discharging liquid medium under high pressure |
| 01/06/1981 | US4243268 Mineral mining installation with planer and jet carrier |
| 12/23/1980 | US4240664 Hydraulic jet cutting tool and method |
| 12/16/1980 | US4239290 Hydromechanical planer with cutting and breaking heads |
| 11/25/1980 | CA1090378A1 Method and device for breaking a hard compact material |
| 11/18/1980 | CA1089885A2 Low profile mining machine |
| 11/11/1980 | US4232904 Method and apparatus for deep mining using chain driven in fixed direction |
| 10/07/1980 | US4226475 Underground mineral extraction |
| 09/30/1980 | US4225190 Mining drum with cutting and shearing bits on conical ring |
| 09/30/1980 | US4225186 Horizontal mining machine and method of slot mining |
| 09/09/1980 | US4221271 Water jet cutting nozzle transition section |
| 09/03/1980 | EP0014776A1 Rock cutter jib |
| 08/26/1980 | US4219239 Mining auger |
| 08/19/1980 | US4218095 Mining unit of coal combines |
| 08/12/1980 | US4216906 Method of making high velocity liquid jet |
| 07/15/1980 | US4212497 Liquid discharge apparatus for a shearing-loader type mining machine |
| 07/15/1980 | CA1081719A1 Method and apparatus for a combined hydraulic- mechanical recovery of extremely hard mineral raw material |
| 05/27/1980 | US4204715 Method and device for breaking a hard compact material |
| 04/15/1980 | US4198098 Mineral winning installations |
| 04/15/1980 | CA1075728A1 Push pull mining system |
| 04/08/1980 | US4196935 Equipment for laying elongate material |
| 04/01/1980 | US4195885 Method and device for breaking a hard compact material |
| 02/26/1980 | US4190296 Apparatus for interconnecting segmented cutter drums of a rotary cutter mechanism |
| 02/26/1980 | CA1072587A1 Method and device for breaking a hard compact material |
| 01/01/1980 | US4181363 Mining method and mining machine for cutting away hard mineral materials |
| 12/04/1979 | US4176883 Oscillating liquid jet system and method for cutting granite and the like |
| 10/30/1979 | US4172616 Cutting head with self-contained power source |
| 09/11/1979 | US4167293 Sprocket tightener |
| 09/11/1979 | US4167292 Method of using a low temperature freezing softening and abrasion fluid |
| 07/31/1979 | CA1059538A2 Method and apparatus for in-cutting and out-cutting during coal mining |
| 07/10/1979 | US4160566 Mining apparatus |
| 05/22/1979 | CA1055054A1 Cutting chains for mining machines |
| 04/24/1979 | CA1053268A1 High pressure pulsed water jet apparatus and process |
| 03/13/1979 | CA1050572A1 Device for building up high pulse liquid pressures |
| 12/26/1978 | CA1045071A1 Hydraulic mining apparatus and method |
| 10/31/1978 | US4123109 Mining method |
| 10/31/1978 | US4123108 Method and device for breaking a hard compact material |
| 10/10/1978 | US4119350 Cutter drum |
| 09/05/1978 | US4111490 Method and apparatus for channel cutting of hard materials using high velocity fluid jets |
| 09/05/1978 | US4111487 Underground mining machine with longwall guidance system |
| 08/01/1978 | US4103971 Method for breaking rock by directing high velocity jet into pre-drilled bore |
| 06/20/1978 | US4095845 Method of and apparatus for the mining of coal |
| 06/13/1978 | US4094549 Process for hydraulically mining coal employing a cutting monitor and a breaking monitor |
| 05/16/1978 | US4089561 Cutter chains having picks and to picks therefor |
| 04/25/1978 | US4085974 Drum cutter |
| 03/21/1978 | US4079999 Method and apparatus for mining |
| 02/28/1978 | US4076311 Hydraulic mining from tunnel by reciprocated pipes |
| 02/21/1978 | US4074858 High pressure pulsed water jet apparatus and process |