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1 A rotary drilling machine with an automatic two piston fixed concentric cylinder diameter space 13 and pin hole area (pin 14 is located
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hose 19 to the swivel 15, whence this fluid drill pipe and through the rotary .nected to diameter than the outer diameter of the pin 27
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2012319-This invention relates to a rotary drilling machine. The invention embodies certain improvements over that type of rotary drilling machine d
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A rotary drilling tool comprising a member connectable in a tubular drill string for rotation with it, and a body about the member having spiral blades
2012119-This invention relates generally to rotary well drilling apparatus and more particularly to a combined rotary drilling machine and rotary ca
