4. Power plants
  5. Pressure fluid source and motor
  6. Servo-motor having externally operated control valve sets...

Robert E. Dummer

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Head brake release with memory and method of controlling a drill

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent

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Marine crane lifting control

Traversing hoists – Having counterweight or counterbalancing means – Counterweight movable relative to load support
Patent

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Tilt preventing system for drills

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

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Unloading arrangement for hydraulic swing circuit or the like

Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent

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Profile ID: LFUS-PAI-P-752327

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