4. Boring or penetrating the earth
  5. With means movable relative to tool to receive, retain, or...
  6. Receiver removable through below-ground tool shaft
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Positive latch core barrel apparatus

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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Propulsion seal for wire line core drilling apparatus

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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