4. Boring or penetrating the earth
  5. Bit or bit element
  6. With fluid conduit lining or element

Donald L. Leibee

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Drill bit

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

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Drill bit

Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent

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Freely rotatable pick bit holder on rotary driven member and met

Mining or in situ disintegration of hard material – Processes
Patent

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Tool for cutting groove in hole

Boring or penetrating the earth – Cutter element laterally shiftable below ground
Patent

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Profile ID: LFUS-PAI-P-47326

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