4. Boring or penetrating the earth
  5. With means movable relative to tool to receive, retain, or...
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Fast descent 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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Flexible plug for obtaining soil samples during drilling operati

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent

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