| Patents for E21C 47 - Machines for obtaining, or the removal of, materials in open-pit mines (773) |
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| 10/02/1990 | US4960306 Open-cut mining cutter |
| 05/31/1990 | WO1990005834A1 Process and device for quarrying and open-cast mining |
| 01/04/1990 | DE3822200A1 Method of excavating limestone |
| 12/05/1989 | US4884848 Device and method for exploiting material |
| 10/26/1989 | DE3912215A1 Mobile two-section slope conveyor |
| 09/27/1989 | CN2044955U Large gravel handling device for gold digging ship |
| 09/26/1989 | CA1261888A1 Open-cut-mining milling unit |
| 07/18/1989 | US4848844 Overburden excavator |
| 06/13/1989 | US4838363 Rock-breaking apparatus |
| 04/20/1989 | DE3834780A1 Dumping jib of a stacker |
| 04/20/1989 | DE3834771A1 Stacker |
| 03/07/1989 | US4810038 Bunker for surface mines and method of forming a storage area for the bunker |
| 03/01/1989 | EP0304421A1 Open-cut mining cutter. |
| 02/16/1989 | DE3725595A1 Crawler mounted bucket wheel excavator - has flexible conveyor belt and carrier system giving greater manoeuvrability |
| 01/18/1989 | CN1030387A Technological field-restoring systematic device for gold-mining ship |
| 12/28/1988 | CA1247664A Apparatus for working deposits by the open-cast working process |
| 10/25/1988 | CA1243533A1 Machine for making cuts in concrete or asphalt |
| 10/18/1988 | US4778221 Movable device for openpit mining |
| 10/13/1988 | DE3710171A1 Winning machine for minerals, in particular for hard rock |
| 06/22/1988 | CN85100384B Hydraulic control system of lithotriptor |
| 06/16/1988 | WO1988004354A1 Mining device |
| 06/08/1988 | EP0270522A2 Device for mining a material |
| 04/21/1988 | WO1988002670A1 Powder pressurizing mechanism in a device for powder-abrasive descaling of rolled steel |
| 01/13/1988 | EP0252465A2 Tracked vehicle to transport heavy loads, especially for open-pit mining |
| 01/07/1988 | EP0250750A1 Transferring device for mined material, particularly for open cast machines |
| 12/23/1987 | CN87104712A Movable apparatus for open-pit mining |
| 12/03/1987 | DE3716895A1 Steinbrecher Quarryman |
| 11/19/1987 | EP0245572A2 Rock breaking apparatus |
| 11/04/1987 | CN87200060U Support frame for strip explosive package for open mining |
| 10/28/1987 | EP0242514A1 Device for adjusting and shifting a loading installation for a winning element |
| 10/22/1987 | WO1987006301A1 Open-cut mining cutter |
| 10/15/1987 | DE3612210A1 Overburden conveying plant for uncovering a mineral seam |
| 09/15/1987 | US4693661 Connecting elevator |
| 08/05/1987 | CN86106946A Improved dragline apparatus |
| 07/07/1987 | US4678236 Apparatus for working deposits by the open-cast working process |
| 04/07/1987 | CA1220231A1 Method of exposing minerals in open-cut mining |
| 11/25/1986 | US4624504 Method of excavating overburden in surface mining operations |
| 10/14/1986 | US4616880 Continuous excavating machine |
| 08/27/1986 | CN85100384A Hydraulic control system of lithotriptor |
| 06/17/1986 | CA1206113A1 Connecting elevator |
| 05/20/1986 | US4589700 Strip-auger method of mining thin seams of hydrocarbonaceous deposits |
| 02/25/1986 | US4572303 Machine for extracting, rough shaping and squaring blocks of stones, marbles and granites, particularly in quarries |
| 09/24/1985 | CA1194048A1 High pressure feeder deflection compensation |
| 06/25/1985 | CA1189486A1 Heavy breaking giant excavating equipment |
| 06/04/1985 | US4520880 Automatic stone cutter |
| 02/19/1985 | CA1182845A1 Installation for two or more step excavating in a discontinuous open cut operation |
| 12/25/1984 | US4489818 For strip-mining operations |
| 12/04/1984 | US4486049 Heavy breaking giant excavating equipment |
| 11/06/1984 | US4480872 Modified strip mining apparatus |
| 05/08/1984 | US4446958 Cross-pit conveyor |
| 02/07/1984 | US4430029 High pressure feeder deflection compensation |
| 02/01/1984 | EP0099791A2 Equipment for extraction of stone,marble or granite,especially from quarries and for roughing and squaring it |
| 10/12/1982 | US4353796 Apparatus for digging and transporting soil and sand, stones and rocks, minerals and the like |
| 08/03/1982 | CA1128967A1 Suface mining method |
| 09/22/1981 | US4290651 Surface mining method |
| 08/25/1981 | CA1107768A1 Scooper-excavator |
| 04/14/1981 | US4261119 Method for digging and transporting material |
| 03/31/1981 | US4258486 Scooper-excavator |
| 03/24/1981 | CA1098086A1 Dragline equipped with hopper means and loading means |
| 03/17/1981 | US4256342 Dragline equipped with hopper means and loading means |
| 03/10/1981 | US4254565 Method for the segmented mining and drying of bentonite |
| 03/03/1981 | US4253256 Self-loading dualistic earth excavator with connecting telescopic conveying and dualistic distribution means |
| 11/25/1980 | CA1090280A1 Method and apparatus for digging and transporting soil and sand, stones and rocks, minerals and the like |
| 01/15/1980 | US4183586 Apparatus for progessively removing layers of overburden from an inclined side of a cut |
| 10/16/1979 | CA1064528A1 Open pit mine |
| 10/09/1979 | CA1064059A1 Apparatus for progressively removing layers of overburden from an inclined side of a cut |
| 09/18/1979 | US4167826 Self-loading dualistic earth excavator with connecting telescopic conveying and dualistic distribution means |
| 01/09/1979 | US4133581 Method of strip mining with cable supported conveyor |
| 04/12/1977 | US4017032 Formation and transportation of slurried unconsolidated overburden |
| 11/30/1976 | US3994349 Apparatus for reclaiming strip-mined land |
| 10/05/1976 | US3983950 Mobile crushing plant |
| 08/31/1976 | USRE28945 Method and apparatus for excavating settled body of solids |
| 06/08/1976 | US3961492 Machine for and method of stemming blast holes |