with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence)

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Percussion drilling > with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence)

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• E21B 1/14 driven by a rotating mechanism
• E21B 1/22 driven by electromagnets
• E21B 1/24 the impulse member being a piston driven directly by fluid pressure