4. Boring or penetrating the earth
  5. With tool shaft detail

David John Jelley

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Method of determining characteristics of a rotary drag-type...

Data processing: structural design – modeling – simulation – and em – Simulating nonelectrical device or system – Mechanical
Reexamination Certificate

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Torque transmitting device for rotary drill bits

Boring or penetrating the earth – With tool shaft detail
Patent

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Profile ID: LFUS-PAI-P-1265607

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