4. Boring or penetrating the earth
  5. With means movable relative to tool to receive, retain, or...
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Bit-stabilized combination coring and drilling system

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Receiver removable through below-ground tool shaft
Patent

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Braking devices for use in drilling operations

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or...
Reexamination Certificate

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