| Patents for E21C 35 - Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups , or (6,127) |
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| 06/06/1990 | CN1008289B Guiding direction apparatus of planing machine chain with supporting board and pulling hook plane |
| 06/05/1990 | US4931638 Method of monitoring hidden coal-rock interface and transducer realizing this method |
| 05/23/1990 | EP0368887A1 Selectively phased water supply of a cutter head. |
| 05/23/1990 | DE3838221A1 Method of controlling heading machines and apparatus for carrying out the method |
| 05/16/1990 | CN1042214A Long range multiple point wireless control and monitoring system |
| 05/15/1990 | US4925247 Method for particle stabilization by use of cationic polymers |
| 05/09/1990 | CA2001681A1 Miner cutting bit holding apparatus |
| 05/01/1990 | US4921310 Tool for breaking, cutting or working of solid materials |
| 05/01/1990 | US4921306 Mining machine and method utilizing intensifier for high and low water pressure to cutting drum |
| 04/11/1990 | EP0362455A1 Chisel arrangement |
| 04/10/1990 | US4915455 Miner cutting bit holding apparatus |
| 04/10/1990 | US4915454 Mining bit and holder |
| 04/05/1990 | DE3929609A1 Mounting for round shafted chisel - has hard metal lined seating which extends its useful life |
| 04/03/1990 | US4913125 Cutter picks |
| 03/29/1990 | DE3931282A1 Control system for coal cutting machine - has array of thrust rams coupled to dosing pumps and control valves |
| 03/28/1990 | CN1040846A Cutter bit and tip |
| 03/27/1990 | US4911504 Cutter bit and tip |
| 03/27/1990 | US4911503 Earth engaging cutter bit |
| 03/22/1990 | WO1990002865A1 Chisel bit arrangement |
| 03/14/1990 | CN1040413A Improved method and apparatus for steering mining machine cutter |
| 03/13/1990 | CA1266651A1 Rock drill with cutting inserts |
| 03/07/1990 | CN1040247A Cutter bit |
| 03/07/1990 | CN1040244A Cemented carbide tip |
| 03/01/1990 | DE3828942A1 Pick arrangement for a winning plough |
| 02/22/1990 | DE3926957A1 Coal cutting plant with cutter and scraper chain conveyor - has cutting distance measurement unit with sensors assigned to cutter unit and electronic evaluation unit |
| 02/22/1990 | DE3925900A1 Verfahren und vorrichtung zum steuern der nachlaufenden schneidtrommel einer doppelendigen schraemmaschine im bergbau Method and device for controlling the trailing cutting drum a double-ended cutting machine in mining |
| 02/20/1990 | US4902073 Cutter pick for mining using hydraulic stream |
| 02/15/1990 | DE3827114A1 Device for securing round-shank picks |
| 02/08/1990 | WO1990001107A1 Cemented carbide tip |
| 02/08/1990 | WO1990001106A1 Cutter bit |
| 02/08/1990 | WO1990001105A1 Cutter bit and tip |
| 01/24/1990 | EP0352243A1 Fluid supply valve for the holder of a cutting tool |
| 01/23/1990 | US4895413 Cutter roller with spraying nozzle |
| 01/18/1990 | DE3824059A1 Arrangement for transmitting the operating data of underground mining machines, for example shearer loaders |
| 01/17/1990 | EP0351245A1 Cutting tool for a mining machine |
| 01/16/1990 | US4893875 Ground engaging bit having a hardened tip |
| 12/07/1989 | DE3818588A1 Method and arrangement for distinguishing between different materials |
| 12/07/1989 | DE3817526A1 Device for cooling the cutters of heading machines, in particular in coal mining |
| 12/06/1989 | EP0345114A1 Tool for a mining machine having an abrasive diamond part |
| 12/05/1989 | US4884847 Apparatus and method for mapping entry conditions in remote mining systems |
| 11/30/1989 | DE3818213A1 Pick, in particular for underground winning machines, heading machines and the like |
| 11/30/1989 | DE3818045A1 Tool for excavating rock and minerals |
| 11/29/1989 | CN2048512U Portable tester for machines |
| 11/28/1989 | US4883129 Bit assembly utilizing carbide insert |
| 11/23/1989 | DE3816505A1 Cutting drum for a winning machine used underground |
| 11/14/1989 | US4880278 Cutting tool for a mining machine |
| 11/14/1989 | US4880247 Cutting tools |
| 11/09/1989 | DE3914200A1 Vorrichtung zum intermittierenden bespruehen von meisseln eines schraemkopfes Apparatus for intermittently spraying carve a cutting head |
| 11/07/1989 | US4878714 Cutting machine for cutting and carrying away material from a work face |
| 10/26/1989 | DE3815249A1 Pick holder for machines for excavating rocks and minerals |
| 10/12/1989 | DE3804987C1 Cable drag chain |
| 10/11/1989 | EP0150210B1 Continuous mining machine |
| 10/05/1989 | DE3902519A1 Thrust-piston mechanism for setting the cutting horizon of underground winning machines |
| 10/05/1989 | DE3844297A1 Pick arrangement, consisting of pick and pick holder, in particular for crushing rolls |
| 10/05/1989 | DE3809741A1 Computer system for mining equipment of an underground operation |
| 09/26/1989 | US4870697 Two-way communication system for winning machines in underground mining |
| 09/26/1989 | US4869358 Conveyor belt system for a continuous mining machine |
| 09/21/1989 | DE3808326A1 Device for advancing the conveyor in working operations |
| 09/20/1989 | EP0332883A1 Crawler mounted drill vehicle |
| 09/12/1989 | US4865392 Rotatable cutting bit |
| 09/07/1989 | DE3806335A1 Cutter head for winning and advance-working machines, in particular selective-cut heading machines with cross-cutting head |
| 09/07/1989 | DE3806224A1 Device for tracking the movement of a moving object, especially of a getter machine in mining |
| 09/07/1989 | DE3805827A1 Cutting drum fitted with sprinkling nozzles for shearer loaders or selective-cut heading machines |
| 09/07/1989 | DE3805825A1 Device for feeding sprinkling liquid to the nozzles of a cutting drum |
| 09/07/1989 | DE3805659A1 Control of the liquid feed of the reversible flow filter of a mining machine in underground use |
| 08/29/1989 | US4861111 Mining cutter-loader for winning minerals |
| 08/24/1989 | DE3803954A1 Spraying arrangement for the cross-cutting head of a selective-cut heading machine and the like |
| 08/22/1989 | US4859543 Earth working tool having a working element fabricated from cemented tungsten carbide compositions with enhanced properties |
| 08/10/1989 | DE3802992A1 Spray valve device for dust suppression in underground spaces, in particular in underground operations with hydraulic support units |
| 08/03/1989 | DE3802656A1 Valve for an air conduit simultaneously used with a water conduit |
| 08/03/1989 | DE3801931A1 Method and circuit for operating a shearer loader hauled by roadway winches |
| 08/01/1989 | US4852947 Operating head with phased fluid delivery |
| 07/27/1989 | DE3803941C1 Bar shield for the face support in collieries |
| 07/25/1989 | US4850649 Rotatable cutting bit |
| 07/20/1989 | DE3800539A1 Lubricating device for shearer loaders in underground operation |
| 07/20/1989 | DE3800426A1 Cutter head for rock or coal extraction |
| 07/12/1989 | EP0147419B1 Rotatable cutting bit |
| 07/11/1989 | US4846631 Gearbox for a rotary, mineral cutting head |
| 07/04/1989 | US4844550 Wear protector for tooth brackets on roadway surface cutting machines |
| 06/29/1989 | DE3841524A1 Apparatus for detecting the cutting horizon for winning machines |
| 06/27/1989 | US4842337 Mining bit and holder |
| 06/21/1989 | EP0321383A1 Device for detecting the cutting horizon for winning machines |
| 06/20/1989 | US4840432 Continuous miner with duct assembly |
| 06/06/1989 | US4836614 Retainer scheme for machine bit |
| 06/06/1989 | US4836613 Cutterhead for water jet assisted cutting |
| 06/06/1989 | US4836178 Inset for a tool |
| 06/01/1989 | DE3838354A1 Kohleabbaumaschine Coal mining machine |
| 05/18/1989 | DE3737525A1 Plough guide for a winning plough |
| 05/09/1989 | US4828327 Bit holder for miner |
| 04/26/1989 | EP0224548B1 Mining machine control system |
| 04/25/1989 | US4823454 Method of attaching a rotatable cutting bit shield |
| 04/18/1989 | US4822105 Double ended ranging drum shearer and method of controlling working height in mining face in use of the same |
| 04/18/1989 | US4821819 Annular shim for construction bit having multiple perforations for stress relief |
| 04/13/1989 | DE3732691A1 Method and device for feeding a water/air mixture to the nozzles of a rotating cutting drum |
| 04/11/1989 | US4819990 Floor cutters for mineral winning ploughs |
| 04/06/1989 | DE3731904A1 Dust-protection device for the machine operator of a selective-cut heading machine |
| 04/05/1989 | CN1032203A Dipper teeth of digging machine |
| 04/04/1989 | US4819273 Mining machine control system |
| 04/04/1989 | US4818027 Round shaft bit |
| 03/23/1989 | DE3730914A1 Halter fuer die kabelkette einer walzenschraemmaschine Holder for the cable chain of a drum shearing machine |