4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Shaft carried guide or protector

John Elsby

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Compensating ring for a down hole hammer

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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Drilling apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Reexamination Certificate

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Transmission sleeve for a down hole hammer

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

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Transmission sleeve for a down hole hammer

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

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Profile ID: LFUS-PAI-P-557140

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