US PATENT SUBCLASS 454 / 91
.~.~.~.~ With air pump

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
83  DF  .~ Railcar, bus, or trailer {10}
88  DF  .~.~ Freight {3}
90  DF  .~.~.~ Refrigerated or heated {1}
91.~.~.~.~ With air pump

DEFINITION

Classification: 454/91

With air pump:

(under subclass 90) Subject matter comprising an apparatus for adding energy to and moving the air.

(1) Note. The air moving apparatus is usually a fan.