US PATENT SUBCLASS 454 / 145
.~.~ Selective inlet, outlet, and closure

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
143  DF  .~ Having inlet airway {7}
145.~.~ Selective inlet, outlet, and closure

DEFINITION

Classification: 454/145

Selective inlet, outlet, and closure:

(under subclass 143) Subject matter comprising means which can be positioned at will to admit air to the ventilated space, to exhaust air from the ventilated space, or to prevent airflow to and from the ventilated space.