4. Boring or penetrating the earth
  5. With means movable relative to tool below ground to stop...
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Earth boring auger

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – With undisturbed core receiver
Patent

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Extension drilling system

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

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Externally powered core catcher

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – With undisturbed core receiver
Patent

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