4. Boring or penetrating the earth
  5. With means movable relative to tool to receive, retain, or...
  6. Core-retaining or severing means
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Rotary drill bits for use in coring holes in subsurface formatio

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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Rotating double barrel core sampler

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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