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2012
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Invention
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Porous secant pile drilling rig and construction technology thereof. A porous secant pile drillin... |
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Invention
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Electric dynamometer. An electric dynamometer comprises a mechanical transmission system and a fr... |
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Invention
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Centering mechanism of casing oscillating drilling machine. A centering mechanism of a casing osc... |
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Invention
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Dead-weight positioning pulley baffle rod frame and crane lifting arm. Disclosed in the present i... |
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Invention
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Hydraulic motor system for unit head of self-cooling rotary drilling rig and rotary drilling rig.... |
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Invention
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Anti-backward-tipping moment limiter for a boom. An anti-back-tipping moment limiter for a boom c... |
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Invention
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Rotary drilling rig and device controlling main hoist lowering speed therefor. Disclosed is a rot... |
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Invention
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Drilling tool and rotary drilling rig having same. Disclosed is a drilling tool. The drilling too... |
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Invention
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Construction equipment using total guard barrel construction method. Construction equipment using... |
