4. Metal working
  5. Method of mechanical manufacture
  6. Structural member making

Robert W. Harper

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Adjustable double link mounting

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

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Multiplexed synchro driver

Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent

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Radiator guard hinge pin

Joints and connections – Structurally installed in diverse art device
Patent

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Sluice gate or penstock door

Movable or removable closures – Panel with closure feature
Patent

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Sluice gate or penstock door

Metal working – Method of mechanical manufacture – Structural member making
Patent

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Profile ID: LFUS-PAI-P-539434

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