| Patents for E21C 25 - Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (2,629) |
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| 07/19/2007 | WO2007082086A2 Assist for raise lower mechanism for a concrete saw |
| 07/19/2007 | WO2007082066A2 Isolation system for movable saws, including a concrete saw |
| 07/19/2007 | US20070164599 Assist for raise lower mechanism for a concrete saw |
| 07/19/2007 | US20070164598 Isolation system for movable saws, including a concrete saw |
| 07/19/2007 | US20070164597 Automated roofing material removal machine and method |
| 07/12/2007 | US20070158995 Arrangement for the admission of pressurized water to spray systems |
| 07/11/2007 | CN2921276Y Ground mine machinery working mechanism with impact type tool |
| 07/11/2007 | CN1997809A Device and method for moving a mine conveyor segment |
| 07/05/2007 | US20070152495 Retainer sleeve and wear ring for a rotatable tool |
| 07/04/2007 | CN2918730Y Side arm cutting means of low coal seam coal cutter |
| 07/04/2007 | CN2918705Y Tunnelling machine carried anchor bar driller device |
| 06/28/2007 | US20070145811 Scaling assembly with pivotally mounted pick component |
| 06/27/2007 | CN2916130Y Hydraulic chain-type grooving machine |
| 06/27/2007 | CN2916129Y Transmission mechanism for cutting head of bolting machine |
| 06/27/2007 | CN1987046A Supporting type continuous tunnelling machine |
| 06/26/2007 | CA2361657C Cutting device |
| 06/21/2007 | US20070138857 Milling arrangement for tunnel walls |
| 06/14/2007 | WO2007066186A1 Brittle material fracturing system |
| 06/14/2007 | US20070132304 Construction machine |
| 06/13/2007 | CN2911187Y Digging-protecting integrated development machine |
| 06/13/2007 | CN2911180Y Cylinder type coal extracting and loading combiner for open-pit coal mine |
| 06/13/2007 | CN2911179Y 3-in-one cutting portion of development machine |
| 06/06/2007 | CN2908781Y Pneumatic down-the-hole gaining machine |
| 06/06/2007 | CN1975109A Coal cutting machine |
| 06/06/2007 | CN1975108A Small size multifunction heading machine |
| 05/30/2007 | EP1790817A1 Flighting and tool holder |
| 05/24/2007 | US20070114835 Flighting and tool holder |
| 05/16/2007 | CN2900793Y Tunnelling and anchoring integrated tunnelling machine |
| 05/16/2007 | CN2900790Y Anti-wear block |
| 05/16/2007 | CN2900789Y Water seal externally placed tunnelling machine cutter part cutterhead |
| 05/16/2007 | CN2900788Y Tunnelling and drilling integrated tunnelling machine |
| 05/16/2007 | CN2900787Y Small coal mine tunnel tunnelling machine |
| 05/16/2007 | CN1965249A Surface real-time processing of downhole data |
| 05/03/2007 | WO2007050263A1 Cold-formed rotatable cutting tool and method of making the same |
| 05/03/2007 | WO2007050262A2 Rotatable cutting tool with reverse tapered body |
| 05/03/2007 | US20070096540 Pavement saw with self-leveling operator handle and depth control system |
| 05/03/2007 | US20070096539 Apparatus and method for cutting asphalt, concrete and other materials |
| 05/02/2007 | CN2895738Y Sieve-moving type coal-production trough-cutting machine |
| 04/26/2007 | US20070090680 Cold-formed rotatable cutting tool and method of making the same |
| 04/26/2007 | US20070090679 Rotatable cutting tool with reverse tapered body |
| 04/26/2007 | US20070090678 Rock boring device |
| 04/24/2007 | US7207632 Shield system for coal mining |
| 04/19/2007 | DE202007002403U1 Antrieb für die Grabtrommel eines Tagebaugewinnungsgerätes Drive for the grave of a drum surface mining equipment |
| 04/12/2007 | US20070080575 Bit block with shroud protector |
| 04/11/2007 | EP1362163A4 A coal and rock cutting pick |
| 03/21/2007 | CN1932240A Full-seam cutting, retreating, separate moving and full-caving comprehensive mechanized coal mining method and equipment |
| 03/20/2007 | US7192094 Auger flight support system |
| 03/20/2007 | US7192093 Excavation apparatus and method |
| 03/08/2007 | US20070052279 Bit assemblies for road milling, mining and trenching equipment |
| 03/07/2007 | CN1923374A New pattern rolling ball rotation impulse jet nozzle |
| 03/01/2007 | US20070046095 Mining device |
| 02/27/2007 | US7182407 Rock boring device with an oscillating and nutating rotary disc cutter |
| 02/22/2007 | US20070040442 Rotary cutting pick |
| 02/21/2007 | EP1754855A1 Tool, in particular for a tunnel boring machine |
| 02/21/2007 | CN2871843Y Automatic spiral residue-extracting rotary hobbing cutter |
| 02/20/2007 | US7179018 Apparatus and method for working asphalt pavement |
| 02/20/2007 | US7178273 Cutting device for cutting trenches in the ground |
| 02/15/2007 | US20070035172 Boring rig |
| 02/14/2007 | CN2869319Y Constant power dual-speed motor driving coal petrograph cutting device |
| 02/13/2007 | US7175237 Hewing or cutting roll |
| 02/06/2007 | US7172256 Rotary cutting bit having spark suppression sleeve |
| 02/01/2007 | US20070024104 Retainer sleeve for a rotary bit |
| 01/31/2007 | CN1904311A Entry-driving machine front complement and hydraulic anchor rad drilling arm system |
| 01/25/2007 | WO2005091899A3 Surface real-time processing of downhole data |
| 01/24/2007 | CN1902377A Core breaker for an earth strata cutting assembly |
| 01/18/2007 | US20070013224 Tool holder block and sleeve retained therein by interference fit |
| 01/17/2007 | CN2858951Y Fluid-pressure leading support means |
| 01/11/2007 | US20070007814 Device for the removal of coverings laid on flat surfaces |
| 01/10/2007 | CN2856416Y Integrated anchor puller |
| 01/03/2007 | CN2854087Y Underholding type large intercept coal-cutting drum of raising lump coal rate |
| 01/03/2007 | CN1888389A Slitting type cutting coal-mining method capable of raising lump-coal yield and special large intercept coal-cutting drum |
| 12/28/2006 | US20060290198 Cutting tool |
| 12/27/2006 | CN1884795A Small-sized drilling, assembling and anchoring integrated machine |
| 12/20/2006 | EP1734224A1 Driving device for rotating tools with superimposed oscillatory movement and tool therefore |
| 12/20/2006 | EP1276969B1 Mining machine and method |
| 12/19/2006 | CA2322693C An arrangement for drilling slots |
| 12/12/2006 | US7147064 Laser spectroscopy/chromatography drill bit and methods |
| 11/29/2006 | CN2842075Y High pressure high-water-base hydraulic brake |
| 11/29/2006 | CN1869401A High efficient short-wall coal-winning machine |
| 11/23/2006 | US20060261663 Spring lock mechanism for a ground-engaging |
| 11/23/2006 | US20060261662 Spring lock mechanism for a ground-engaging tool |
| 11/22/2006 | CN1865657A Comprehensive coal-mining process by using long wall mining method |
| 11/16/2006 | WO2005106137A3 Excavation apparatus and method |
| 11/16/2006 | US20060255649 Mining lacing pattern |
| 11/08/2006 | CN2835555Y Coal cutter for mining thin coal seam |
| 11/02/2006 | WO2006115797A2 Retainer for cutting bit |
| 11/01/2006 | CN2833109Y Portable chain saw type coal cutter |
| 11/01/2006 | CN2833108Y Screw drum for cutting head of development machine |
| 11/01/2006 | CN2833107Y Hydraulic device for excavator and jumbolter |
| 10/26/2006 | US20060238016 Retainer for cutting bit |
| 10/26/2006 | US20060238015 Streamlining bit assemblies for road milling, mining and trenching equipment |
| 10/25/2006 | CN2830639Y Small dual-arm coal development machine |
| 10/25/2006 | CN2830638Y Ecological environment protection small coal development machine |
| 10/18/2006 | CN1847614A Underground mining machine |
| 10/12/2006 | WO2006023657A3 Methods for constructing underground borehole configurations and related solution mining methods |
| 10/11/2006 | CN2825947Y Blowout preventer for drill of protrusive coal seam |
| 10/04/2006 | EP1706585A1 Core breaker for an earth strata cutting assembly |
| 10/04/2006 | EP1706579A1 Holding wrench for rock drilling machine and rock drilling machine including such a holding wrench |
| 09/28/2006 | US20060214496 Mining roof support cylinder corrosion protection apparatus and method |
| 09/27/2006 | CN2821631Y Intelligent control system for tunneller cutting |