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overseeing assembly of the drilling tools and connecting sections of drill pipe, operating recalls finishing a job in the Third World where he had been on the drill floor for 72 hours

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A drill bit for drilling a borehole in an earth formation. The drill bit has a central longitudinal axis and may be operated by applying at least a rotary motion about the central longitudi

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While the pump-drill and the bow-drill were used in to bore smaller holes for a larger part and a minority are driven by an internal combustion engine(for example, earth drilling aug

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ice core Finding a 1.5 million-year record of Earth’s climate

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Pneumatic hammer drilling assembly for use in directional drilling -

5. A method for drilling a borehole with the use of a drilling assembly positioned in the borehole, the drilling assembly comprising a drilling bit having a distal end which defines a d

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earth drilling machines, and in particular to a novel drive head assembly for such a mach for attachment to drill pipe. A drive motor, transmission gearing and the drive head are m

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The present invention relates to a drilling equipment, especially for drilling in earth or loose rock, comprising an inner central drill bit, an outer ring-shaped drill bit, and a casing pip

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