4. Boring or penetrating the earth
  5. Bit or bit element
  6. Impact or percussion type

Mark Ziegenfuss

Inventor

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Boost LED driver not using output capacitor and blocking diode

Electric lamp and discharge devices: systems – Condenser in the supply circuit – Arc machining
Reexamination Certificate

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Self-propelled earth drilling hammer-bit assembly

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent

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Profile ID: LFUS-PAI-P-950012

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