4. Motors: spring, weight, or animal powered
  5. Spring
  6. With winding means
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Easy opening door control device

Motors: spring – weight – or animal powered – Spring – With winding means
Patent

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Elastic energy storing device

Motors: spring – weight – or animal powered – Spring – With winding means
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Elastic motor having time-averaged constant torque output

Motors: spring – weight – or animal powered – Spring – With winding means
Reexamination Certificate

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Elastic motor with constant torque output

Motors: spring – weight – or animal powered – Spring – With winding means
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Electric actuators

Motors: spring – weight – or animal powered – Spring – With winding means
Patent

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Electro-mechanical pivot wing drive for pivoting wings of doors

Motors: spring – weight – or animal powered – Spring – With winding means
Patent

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