4. Boring or penetrating the earth
  5. With means movable relative to tool below ground to stop...
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Up-hole overshot and safety drilling apparatus

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – With longitudinally spaced valve seats
Reexamination Certificate

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Up-hole pump-in core barrel apparatus

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – In sample receiver removable through below-ground tool shaft
Reexamination Certificate

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