| Patents for E21C 25 - Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (2,629) |
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| 07/22/2009 | CN201277033Y Cutting arm of continuous miner |
| 07/15/2009 | CN201273191Y Transmission mechanism for cutting part of development machine |
| 07/09/2009 | US20090174252 Tip for an earth working roll |
| 07/08/2009 | CN201269103Y Drift driving construction system |
| 07/08/2009 | CN201269102Y Full-automatic safety development machine for coal mine |
| 07/08/2009 | CN101476464A Double-row driving chainless traction system of coal mining machine |
| 07/01/2009 | CN201265415Y Reinforcement type atomizing cutting head |
| 06/24/2009 | CN101463722A Roof bolter mechanism |
| 06/17/2009 | CN201258739Y Development machine capable of loading coal onto transport vehicle directly |
| 06/17/2009 | CN201258738Y Development machine with hydraulic winch |
| 06/17/2009 | CN101457641A Development machine cutting telescopic arm with pipeline lifting chain |
| 06/11/2009 | US20090146491 Breaking or excavating tool with cemented tungsten carbide insert and ring |
| 06/11/2009 | US20090146490 Breaking or excavating tool with cemented tungsten carbide insert and ring |
| 06/11/2009 | US20090146489 Retention System |
| 05/27/2009 | EP2061718A1 Transportation of sulphur from solid sulphur deposits, in blocks of large dimensions |
| 05/27/2009 | CN201247045Y Measuring system for cantalever digging handpiece location posture |
| 05/21/2009 | US20090127918 Vibratory milling machine having linear reciprocating motion |
| 05/13/2009 | CN201236706Y Temporary support apparatus for digging tunnel |
| 05/13/2009 | CN201236705Y Hob cutter type coal mining machine tumbling cylinder |
| 05/13/2009 | CN201236704Y Coal drift drill shipping and anchoring integrated machine |
| 05/13/2009 | CN101429867A Major cycle slanting extraction method for coal mining work surface |
| 05/13/2009 | CN100487222C Energy saving method for rock drilling and tunneling driven by potential energy of water from deep well mining |
| 05/13/2009 | CN100486792C Injection moulding heating method for diamond rope saw and apparatus |
| 05/12/2009 | CA2408970C Cutting tool and method of using same |
| 04/30/2009 | US20090108041 Breaker Tool |
| 04/29/2009 | CN101418689A High mining height workface stepped coal cutting process |
| 04/28/2009 | US7523996 Auger car bearing support |
| 04/23/2009 | WO2009052054A1 Systems, methods, and processes utilized for treating subsurface formations |
| 04/22/2009 | CN201225153Y Rock lane digging and supporting construction drill |
| 04/22/2009 | CN201225152Y Combined cutting tool of block extraction coal cutting machine |
| 04/22/2009 | CN201225151Y Development machine cutting telescoping device with empty filter |
| 04/15/2009 | EP1497536B1 Oscillating disc cutter with speed controlling bearings |
| 04/15/2009 | CN101408105A Digging mechanism of cantilevered type digging machine |
| 04/15/2009 | CN100478543C Small size multifunction heading machine |
| 04/09/2009 | WO2009043234A1 A track-mounted elevator top and side bolts and cables drilling machine |
| 04/09/2009 | US20090091177 Mineral cutter system |
| 04/08/2009 | CN101403302A Pedrail type liftable anchor bar anchor cable construction drill rig and double-lane fast digging technique |
| 04/02/2009 | US20090085396 Tool holding device |
| 04/01/2009 | CN201215014Y Development machine capable of continuously conveying |
| 04/01/2009 | CN201215013Y Second conveyor of development machine |
| 04/01/2009 | CN201215012Y Hydraulic rock development machine |
| 03/26/2009 | WO2009036781A1 Roller drill or roller bit |
| 03/18/2009 | CN201209446Y Boring and protecting integrative machine |
| 03/18/2009 | CN101387201A Conveyor pan with improved edge shaping |
| 03/18/2009 | CN101387200A A continuous miner having pivoting drilling platforms |
| 03/17/2009 | US7503629 Pick locking device including a clamp element and a retaining pin |
| 03/17/2009 | CA2589743C Rock boring device |
| 03/11/2009 | CN201206465Y Lifting and rotating coal cutting machine |
| 03/05/2009 | US20090058172 Mining machine with driven disc cutters |
| 03/05/2009 | US20090056943 enhancing oil recovery; introducing a flooding fluid containing water, surfactants and carbon dioxide into the reservoir; extracting the oil through a wellbore at a location different than the point of introduction of the flooding fluid; decrease in surface tension and increase in viscosity |
| 02/28/2009 | CA2821383A1 Mining machine with driven disc cutters |
| 02/28/2009 | CA2639170A1 Mining machine with driven disc cutters |
| 02/26/2009 | US20090051211 Thick Pointed Superhard Material |
| 02/25/2009 | CN201198760Y Safe high-efficiency integrative matching equipment of large excavating high automatic fully mechanized working face |
| 02/25/2009 | CN201198758Y Fluent type loading device of coal excavating development machine |
| 02/24/2009 | US7494191 Manhole ring saw cutting device |
| 02/23/2009 | CA2638857A1 Reduced volume cutting tip and cutter bit assembly incorporating same |
| 02/19/2009 | DE202008015772U1 Vorrichtung für tonlägige und steil einfallende Flöze Apparatus for tonlägige and steeply dipping coal seams |
| 02/11/2009 | CN100460627C Detachable jaw crusher for drifting machine |
| 02/05/2009 | WO2008105915A3 Thick pointed superhard material |
| 02/05/2009 | US20090033140 Use Of Foam To Increase Resistance To Gas Flow In Mine Applications And Apparatus For Delivering Same |
| 02/04/2009 | EP2019908A2 Systems and methods for wound area management |
| 02/04/2009 | CN201190568Y High strength special mounting frame for large-scale coal cutter |
| 02/04/2009 | CN101358528A Roadheader with remote control member |
| 01/29/2009 | US20090026829 Rotary cutting pick |
| 01/21/2009 | CN201183744Y Coal mining drill jack supporting device |
| 01/15/2009 | US20090015056 Depth Detecting Assembly |
| 01/14/2009 | CN201180611Y Split type hydroturbine speed reducer |
| 01/14/2009 | CN201180544Y Intelligent full-automatic combined coal mining system |
| 01/13/2009 | US7475947 Extendable cutter drum for a boring machine |
| 01/08/2009 | WO2009006612A1 Wear resistant tool |
| 01/07/2009 | CN201176876Y Shield tunneling type coal mine gate road dig-anchor machine set |
| 01/07/2009 | CN101338672A Digging laneway temporary support device |
| 01/07/2009 | CN101338671A Hob cutter type coal cutter drum |
| 12/31/2008 | CN201173121Y Tunelling driving single machine device |
| 12/25/2008 | US20080315667 Braze Thickness Control |
| 12/24/2008 | CN201170098Y Development machine cantalever segment |
| 12/18/2008 | US20080309149 Braze Thickness Control |
| 12/18/2008 | US20080309148 Degradation Assembly Shield |
| 12/18/2008 | US20080309147 Shield of a Degradation Assembly |
| 12/18/2008 | US20080309146 Degradation assembly shield |
| 12/16/2008 | CA2406623C Mining machine and method |
| 12/11/2008 | DE10390198B4 Träger für eine fliegende Schneiddiskenlagerung Support for a flying cutting disk storage |
| 12/09/2008 | US7461902 Auger car bearing support |
| 12/04/2008 | WO2008063977A3 Edge cutter assembly for use with a rotatable drum |
| 12/04/2008 | US20080296959 Cutter head for a ground cutter machine having rotary cutters |
| 11/27/2008 | WO2007082086A3 Assist for raise lower mechanism for a concrete saw |
| 11/26/2008 | CN201155328Y Splicing device between cantilevered mechanical boring machine and back matched belt reload machine |
| 11/26/2008 | CN201155327Y Development machine |
| 11/26/2008 | CN100436753C Rock cutting machine |
| 11/19/2008 | CN201152173Y Outburst-proof diggning anchor machine set |
| 11/13/2008 | DE102007022439A1 Versorgungsleitungsstrang Supply wiring harness |
| 11/12/2008 | CN201148872Y Hydraulic device for controlling cutting head action of development machine |
| 11/12/2008 | CN201148868Y Development machine cutting portion |
| 11/12/2008 | CN101302934A Coal mining method with three steps |
| 11/12/2008 | CN101302932A Method for underground chamber digging and laneway opening digging |
| 11/12/2008 | CN101302930A Three-cylinder coal cutter |
| 11/05/2008 | CN201144902Y Hydraulic system for development machine |
| 11/05/2008 | CN201144701Y Light belt conveyor |
| 11/05/2008 | CN201144699Y Lump cutting device for coal mining |