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Double-drive automatic sliding door operator

Movable or removable closures – Closures interconnected for concurrent movement – Opposed similar movement
Patent

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Drive-in window

Movable or removable closures – Closures interconnected for concurrent movement – Opposed similar movement
Patent

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Drum and cable mechanisms for opening/closing greenhouse vent

Movable or removable closures – Closures interconnected for concurrent movement – Closures in spaced openings along barrier
Patent

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Dual louver blade jalousie window

Movable or removable closures – Closures interconnected for concurrent movement – Louver-type closures
Patent

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Dual overhead track for a sliding door

Movable or removable closures – Closures interconnected for concurrent movement – Opposed similar movement
Reexamination Certificate

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Dual panel jalousie assembly with independent panel movement

Movable or removable closures – Closures interconnected for concurrent movement – Louver-type closures
Reexamination Certificate

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Dual panel system for controlling the passage of light...

Movable or removable closures – Closures interconnected for concurrent movement – Louver-type closures
Reexamination Certificate

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