4. Boring or penetrating the earth
  5. Below-ground impact members
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Pneumatic percussive device

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

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Pneumatically reversible ram boring device

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

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Positive release means for articulated flexible shaft

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Pressure reversing valve for a fluid-actuated, percussive drilli

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

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Pressurized fluid flow system for a reverse circulation hammer

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

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