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Arrangement in a gate

Movable or removable closures – Time controlled – Predetermined delay governs start of closure movement
Patent

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Automatic door closing device

Movable or removable closures – Time controlled
Reexamination Certificate

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Automatic operating system and method for swinging doors

Movable or removable closures – Time controlled
Patent

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Garage door closing apparatus

Movable or removable closures – Time controlled – Predetermined delay governs start of closure movement
Patent

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Method and apparatus for controlling automatic opening and closi

Movable or removable closures – Time controlled
Patent

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Safety gate for vehicle wheel alignment pit installations

Movable or removable closures – Time controlled – Predetermined delay governs start of closure movement
Patent

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Time delay release mechanism for a fire barrier

Movable or removable closures – Time controlled – Predetermined delay governs start of closure movement
Patent

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Time delay release mechanism for a fire barrier

Movable or removable closures – Time controlled – Predetermined delay governs start of closure movement
Patent

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Traffic responsive control system for automatically operated doo

Movable or removable closures – Time controlled – Predetermined delay governs start of closure movement
Patent

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Universal garage door closer

Movable or removable closures – Time controlled
Patent

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