US PATENT SUBCLASS 454 / 904
MAGNETIC MEANS TO HOLD A DAMPER CLOSED

Current as of: June, 1999
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454 /   HD   VENTILATION

904MAGNETIC MEANS TO HOLD A DAMPER CLOSED

DEFINITION

Classification: 454/904

MAGNETIC MEANS TO HOLD A DAMPER CLOSED:

(under the class definition) Subject matter comprising a means for permitting or preventing airflow and further comprising means using magnetic force to maintain in position the airflow permitting or preventing means so as to prevent airflow.