4. Boring or penetrating the earth
  5. Tool removable or insertable through or around driving or...
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Retractable core drill bit

Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Patent

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Retractable drill bit system

Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Patent

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Retractable well drilling bit

Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Patent

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Retraction system for a latching mechanism of a tool

Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Patent

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Retrieval head for a drill bit composed of a plurality of...

Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Reexamination Certificate

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