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Title of patent family (most common patent title) |
Family members |
Filing year |
---|---|---|
detachable combined-type drive key for rotary drilling rig power head | 6 | 2013 |
power head of rotary drilling rig and rotary drilling rig | 3 | 2015 |
driving and connecting device for rotary drilling rig power head pile casing | 2 | 2011 |
multilayer drill pipe structure of pneumatic down-hole hammer | 2 | 2015 |
square shaft structure of rotary drilling rig | 2 | 2009 |
power head multi-gear mode control device and method of rotary drilling rig and rotary d… 🛈 | 2 | 2015 |
safety control device for regulating pressures of jaw vices of horizontal directional dr… 🛈 | 2 | 2015 |
winch pressurization control device as well as control method and rotary drilling rig of… 🛈 | 2 | 2015 |
rotary drilling rig capable of realizing positive and negative circulation pneumatic dow… 🛈 | 2 | 2015 |
power head mechanism of down-hole hammer drill | 2 | 2015 |