4. Boring or penetrating the earth
  5. With means movable relative to tool to receive, retain, or...
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Device for closing a core barrel installed in a drilling rig

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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Device to control the locking of a boring corer

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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Double core barrel

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

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Down-the-hole motor for rotary drill rod and process for drillin

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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Drilling apparatus, particularly wire line core drilling apparat

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

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Drilling tool with retractable pilot drilling unit

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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