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Object detection by signal field mapping

Movable or removable closures – Safety means responsive to obstruction to closure
Reexamination Certificate

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Obstruction sensing a signal transmitted across window

Movable or removable closures – Safety means responsive to obstruction to closure
Reexamination Certificate

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Obstruction sensing system for a gate

Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Reexamination Certificate

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Obstruction sensor for electro-mechanically operated garage door

Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Patent

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Opening/closing device

Movable or removable closures – Safety means responsive to obstruction to closure
Reexamination Certificate

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Overhead door sensor mounting bracket

Movable or removable closures – Safety means responsive to obstruction to closure
Patent

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Overhead door with dual safety-edge

Movable or removable closures – Safety means responsive to obstruction to closure – Sensing shoe on leading edge
Reexamination Certificate

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