4. Tool driving or impacting
  5. Automatic control of power operated means
  6. Drive means responsive to torque or speed condition

Alexander Hoop

Inventor

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Percussion blow added manually operable drilling tool

Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent

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Pneumatic percussive mechanism

Tool driving or impacting – Impacting devices – Hammer head driven by pulsating fluid pressure
Reexamination Certificate

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Profile ID: LFUS-PAI-P-573925

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