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US4515068A
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Damper with integral mounting means
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Damper with integral support
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Motor operated fire damper
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Damper frame construction
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Damper assembly
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Vacuum relief and access door assembly
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Vacuum relief door assembly
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Control damper
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Damper construction and spring
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US3907020A
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Fire damper
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Air duct access door
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Control damper construction
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US3738254A
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Backdraft damper
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US3677517A
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Wrap-around damper frame
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Control damper construction
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US3606245A
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Control damper
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US3566916A
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Inlet vane damper
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US3580321A
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Smoke damper
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US3525378A
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Damper construction and spring
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