| Patents for E21C 29 - Propulsion of machines for slitting or completely freeing the mineral from the seam (839) |
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| 05/15/1979 | US4154480 Mineral mining installation |
| 05/15/1979 | US4154479 Hauling system for underground workings |
| 02/20/1979 | US4140951 Mining machine |
| 01/23/1979 | CA1047053A1 Device for guying a movable cutting machine |
| 12/26/1978 | US4131317 Mining machine having advancing mine roof supports |
| 12/19/1978 | US4130319 Mining machines |
| 10/03/1978 | US4118072 Variable wall mining machine |
| 09/05/1978 | US4111489 Stacked mineral mining plows independently driven or coupled |
| 08/01/1978 | US4103975 Mining machine particularly a drum-cutter mining machine |
| 07/11/1978 | US4099787 Mining machine |
| 07/11/1978 | US4099786 Apparatus for drawing the shearers |
| 06/27/1978 | US4097091 Method and apparatus for securing mining machines employed on inclined or steep seams |
| 06/20/1978 | US4095478 Sprocket-wheel, especially for mining machines |
| 06/13/1978 | US4094157 Anchoring apparatus for anchoring a mining installation |
| 05/09/1978 | US4088370 Haulage arrangements for mineral mining machines |
| 05/02/1978 | US4087132 Device for guying a movable cutting machine |
| 04/18/1978 | US4084854 Drag bit excavation |
| 04/04/1978 | US4082361 Rack device for a mining machine |
| 03/14/1978 | US4078452 Drive systems for mining apparatus |
| 02/28/1978 | US4076317 Device for guying a movable cutting machine |
| 01/10/1978 | US4067620 Rack-driven mining machine with pivotal guide shoe |
| 12/20/1977 | US4063782 Long wall mining apparatus guide structure |
| 10/25/1977 | US4055367 Longwall machine with captivating bracket |
| 10/18/1977 | US4054321 Track-mounted shoe-supported inclining mining machine |
| 09/20/1977 | US4048866 Apparatus for use in controlling the tension of a chain or chains of mining equipment |
| 08/30/1977 | US4045083 Longwall mining machine with haulage motor sensed pressure controlled rail brake |
| 08/23/1977 | US4043213 Drive assemblies for mining apparatus |
| 07/26/1977 | US4037876 Tightening arrangement for longwall mining machine cable and conveyor |
| 05/24/1977 | US4025120 Feed system of a coal getting combine |
| 03/29/1977 | US4014574 Mining machine having rectangular thrust transmitting conveyor column |
| 02/08/1977 | US4006937 Carriage especially for use in mines |
| 12/28/1976 | US3999488 Gripping drivers locomotive |
| 11/09/1976 | US3990349 Device for effecting translational movement of a machine |
| 09/14/1976 | US3980342 Auger type mining machine |
| 08/17/1976 | US3975056 Longwall canted drum mining machine |
| 07/13/1976 | US3968754 Chain drive arrangement for a mining machine |
| 05/04/1976 | US3954300 Mining machine longwall propulsion means |
| 04/13/1976 | US3949815 Shallow-hole kerf boring machine with auger on side-arm elevating assembly |
| 02/10/1976 | US3937151 Mineral mining equipment |