4. Motors: spring, weight, or animal powered
  5. Spring

Weyman Weems

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Constant force spring actuator

Motors: spring – weight – or animal powered – Spring
Patent

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Electromagnetic latch

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Work or object holding type
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1919836

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