4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element

Carl S. M. Hartwig

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Combustion engine system

Power plants – Fluid motor means driven by waste heat or by exhaust energy...
Patent

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Compressor drive system

Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent

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Drive system for A.C. motors

Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural – diverse motor controls for different motors
Patent

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Electrically driven hammer machine

Tool driving or impacting – Impacting devices – Hammer head driven by electric motor
Patent

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Hand-held hammer tool

Tool driving or impacting – Impacting devices – With means for rotating tool
Patent

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Profile ID: LFUS-PAI-P-219504

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