4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Helix or helically arranged structure

William L. Acker, III

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Chuck apparatus and method

Chucks or sockets – With fluid-pressure actuator – Socket type
Patent

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Lock device for hollow stem augers

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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Profile ID: LFUS-PAI-P-1041776

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