4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Discharge passage for motive fluid directed toward bore...
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Percussive air hammer and core bit apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – Discharge passage for motive fluid directed toward bore...
Patent

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Pressure-modulation valve assembly

Boring or penetrating the earth – With below-ground tool drive prime mover – Discharge passage for motive fluid directed toward bore...
Patent

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