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

Leon R. Walker

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Concrete drop hammer attachment device

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

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Device for breaking concrete

Tool driving or impacting – Means to control advance and cyclically reciprocate a... – Relatively elevated guide engaging cable between drive and...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1865255

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