4. Boring or penetrating the earth
  5. With means movable relative to tool to receive, retain, or...
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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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Rotating dry drilling bit

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core bit closure relative upwardly movable by core
Reexamination Certificate

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Rotating dry drilling bit

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core bit closure relative upwardly movable by core
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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