4. Tool driving or impacting
  5. Self-acting advance and retraction cycle

David L. Hoover

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Guided drilling system with shock absorber

Tool driving or impacting – Self-acting advance and retraction cycle
Patent

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Live vaccine against Brucellosis

Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Recombinant dna technique included in method of making a...
Reexamination Certificate

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