4. Elevator, industrial lift truck, or stationary lift for vehicle
  5. With barrier for regulating access to load support
  6. Includes motor or motor driven linkage for shifting barrier

Richard Pustelniak

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Interference compensation optically synchronized safety...

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Method and apparatus for detecting position of an elevator door

Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Includes motor or motor driven linkage for shifting barrier
Utility Patent

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Profile ID: LFUS-PAI-P-2050244

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