4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
  6. Cutter element shifted by fluid pressure

Archer W. Kammerer, Jr.

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Bore hole airhammer and anvil bit

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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Borehole drilling apparatus

Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Patent

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Method for producing chambered blast holes

Mining or in situ disintegration of hard material – Processes – Explosive
Patent

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Stabilizer and rotary expansible drill bit apparatus

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Profile ID: LFUS-PAI-P-861558

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