4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Continuous unidirectional rotary motion of one telescoping...
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Bottom rotation shaft actuator

Boring or penetrating the earth – Below-ground impact members – Continuous unidirectional rotary motion of one telescoping...
Patent

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Impact cam subassembly for drills

Boring or penetrating the earth – Below-ground impact members – Continuous unidirectional rotary motion of one telescoping...
Patent

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Method and apparatus for subsurface exploration

Boring or penetrating the earth – Below-ground impact members – Continuous unidirectional rotary motion of one telescoping...
Reexamination Certificate

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