|
US4064670A
|
|
Rainproof louver
|
|
CA1031313A
|
|
Condition controlling air flow damper
|
|
US3963070A
|
|
Condition controlling air flow damper
|
|
US3837268A
|
|
Protective damper for gas exhaust duct
|
|
US3826179A
|
|
Differential pressure responsive damper
|
|
US3771559A
|
|
Damper
|
|
US3894481A
|
|
Multi-blade damper
|
|
US3668999A
|
|
Fluid back pressure damper
|
|
US3650069A
|
|
Fire damper blade latch
|
|
CA925355A
|
|
Fire damper blade latch
|
|
US3575229A
|
|
Smoke seal for curtain-type fire dampers
|
|
US3591221A
|
|
Fire damper latch
|
|
US3521692A
|
|
Fire damper or the like
|
|
US3426667A
|
|
Air intake apparatus
|
|
US3413905A
|
|
Air intake
|
|
US3341971A
|
|
Fire damper
|
|
US3313226A
|
|
Blade mounting means for air control apparatus
|
|
US3287870A
|
|
Weatherproof louverf
|
|
US3249038A
|
|
Air intake
|
|
US3342211A
|
|
Damper for controlling the flow of fluids
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