4. Movable or removable closures
  5. Safety means responsive to obstruction to closure
  6. Closure drive stopping or reversal
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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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