| Patents for E21C 25 - Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (2,629) |
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| 01/17/1978 | US4068896 Mineral cutter chains |
| 01/17/1978 | US4068894 Mining machine cowl assembly |
| 12/13/1977 | US4062594 Reciprocating drive method of mining and apparatus therefor |
| 11/22/1977 | US4059309 Apparatus and method for cutting elongated slots in earth formations |
| 11/22/1977 | US4059163 Mine drilling apparatus and method |
| 09/20/1977 | US4049318 Mining machine with cam-operated water jet pump |
| 08/30/1977 | US4045088 Oscillating disk thin seam mining machine with steering |
| 08/30/1977 | US4045086 Pumpable product hydraulic mining apparatus and method |
| 06/28/1977 | US4032195 Push-pull mining system |
| 05/24/1977 | US4025116 Method of operating a constant depth linear cutting head on a retrofitted continuous mining machine |
| 05/03/1977 | US4021126 Latch mechanism for auger string couplings |
| 05/03/1977 | US4021076 Wire communications channel for a pair of unitized augers |
| 04/05/1977 | US4015674 Apparatus for unitizing a pair of augers |
| 03/15/1977 | US4012076 Process for hydraulically mining coal |
| 02/08/1977 | US4006935 Mining machines |
| 12/14/1976 | US3997111 Liquid jet cutting apparatus and method |
| 12/07/1976 | US3995908 Hydraulic-mechanical coal mining combine |
| 11/23/1976 | US3993354 Multi-level hydraulic mining system |
| 11/02/1976 | US3989115 Adjustable gage cutter scraper for tunneling machines |
| 10/05/1976 | US3984147 Mining machines with extensible probe arm |
| 09/14/1976 | US3980340 Method for longwall mining with side-by-side arch sections |
| 08/31/1976 | USRE28945 Method and apparatus for excavating settled body of solids |
| 08/17/1976 | US3975056 Longwall canted drum mining machine |
| 08/03/1976 | US3972375 Auger drive with auxiliary powertrain boxes |
| 07/13/1976 | US3968995 Continuous mining machine with a chain drive for the cutting head |
| 07/06/1976 | US3967909 Latching and latch releasing mechanism for auger string couplings |
| 06/01/1976 | US3960407 Cutters and methods of cutting |
| 05/25/1976 | US3958830 Longwall mining system and archshield for mining tar sands, oil shales and the like |
| 05/04/1976 | US3954301 Chain link conveyor apparatus for cutting hard earth formations |