4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Fluid-operated
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Backhead and check valve for down-hole drills

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

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Backhead and check valve for down-hole drills

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Backhead and drill assembly with backhead

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Bedrock drilling and excavating apparatus

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Bidirectional fluid operated vibratory jar

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Bit retention device for a bit and chuck assembly of a down-the-

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Bumping and jarring tool

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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