US PATENT SUBCLASS 454 / 167
.~ With air pump

Current as of: June, 1999
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454 /   HD   VENTILATION

166  DF  VEHICULAR TUNNEL {1}
167.~ With air pump

DEFINITION

Classification: 454/167

With air pump:

(under subclass 166) Subject matter comprising an air moving apparatus for forcing fresh air to or stale air from the enclosed passageway.