CN102116167A
|
|
Ground and underground three-dimensional extraction system of coal seam gas
|
CN102116140A
|
|
Construction method for enhancing extraction effect of ground coal bed gas
|
CN102102538A
|
|
Orifice data processing device for coal mine underground measurement while drilling
|
CN102094582A
|
|
Processing method of bimetallic oil distributing sleeve for full-hydraulic drilling machine
|
CN102022090A
|
|
Nitrogen spring type drilling machine hydraulic chuck
|
CN102022317A
|
|
Water absorption and drainage device for high stroke frequency liquid-driven slurry pump
|
CN102031950A
|
|
Hole-forming process method for comb gas extraction borehole in coal seam roof
|
CN101775965A
|
|
Open-top composite clamp holder
|
CN101799466A
|
|
Physical simulation device and simulation method for coal bed methane production
|
CN101769134A
|
|
Sealed core drilling device for underground coal seams and application method thereof
|
CN101877020A
|
|
Method for drawing drilling track graph in AutoCAD by using VBA module
|
CN101709642A
|
|
Track-type four-arm rock drilling jumbo
|
CN101709623A
|
|
Integral coal mine drilling machine hydraulic system capable of satisfying multiple drilling modes
|
CN101709774A
|
|
Automatic lubrication device for planet wheel bearing
|
CN101936139A
|
|
Integrated wind-blade spiral drilling rod for air pressure drilling
|
CN101538989A
|
|
Quick-change slips hydraulic rubber cylinder chuck
|
CN101498220A
|
|
Vertical shaft working surface artesian flow sand layer slurry protecting rotary spraying grouting process
|
CN101446178A
|
|
Wind pressure air drilling equipment in downhole soft outbursting coal bed and process matched therewith
|
CN101343997A
|
|
Directional tool of horizontal long drill hole
|
CN101345591A
|
|
Portable terrane communication machine
|