4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Telescoping members relatively rotatable
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Device in impact machines

Boring or penetrating the earth – Below-ground impact members – Telescoping members relatively rotatable
Patent

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Downhole case driving apparatus for impact drills

Boring or penetrating the earth – Below-ground impact members – Telescoping members relatively rotatable
Patent

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Percussion boring tool

Boring or penetrating the earth – Below-ground impact members – Telescoping members relatively rotatable
Patent

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Rotary drilling jar

Boring or penetrating the earth – Below-ground impact members – Telescoping members relatively rotatable
Patent

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Working tool for a percussion power tool

Boring or penetrating the earth – Below-ground impact members – Telescoping members relatively rotatable
Reexamination Certificate

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