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AU5481099A
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Automatic door safety system with multiple safety modes
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US6155324A
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Apparatus and method for operating a door
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US5082316A
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Release mechanism and method with alarm circuit
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US4995651A
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Release mechanism and method
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US4721146A
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Rolling door operating mechanism
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US4130156A
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Time delay fire closure releasing device
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US3334725A
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Retractable wall apparatus and drive mechanism therefor
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US3231005A
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Closure with track covering means
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US3134273A
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Rolling door control device
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US3007342A
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Rolling door operating mechanism
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US2940520A
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Grille
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US2952751A
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Astragal with pressure switch
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US2934139A
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Side coiling articulated partition and drive mechanism therefor
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US2820516A
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Door construction
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US2763036A
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Door construction
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