4. Tool driving or impacting
  5. Automatic control of power operated means
  6. Tool advance causing or controlling means

Lester A. Amtsberg

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Hydraulic powered rock drill

Tool driving or impacting – Impacting devices – Hammer head moves in arcuate path or rotates
Patent

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Hydraulic rock drill

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent

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Hydraulic rock drill with stroke responsive advance

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent

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Rotatable drill string having a torsionally elastic shaft drivin

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

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Profile ID: LFUS-PAI-P-1439160

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