4. Tool driving or impacting
  5. Means to drive tool about an axis
  6. Means to hold and relatively rotate sections of tool shaft

Raymond W. Burns

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Hollow auger head assembly

Boring or penetrating the earth – Processes
Reexamination Certificate

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Hollow auger head assembly

Boring or penetrating the earth – Bit or bit element – Core forming type
Patent

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Hollow auger head assembly

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Reexamination Certificate

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Hollow auger head assembly

Boring or penetrating the earth – Processes
Reexamination Certificate

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Hydraulic kelly bar chuck

Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent

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Profile ID: LFUS-PAI-P-1084444

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