US PATENT SUBCLASS 454 / 276
.~.~ Wall type


Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
275  DF  .~ Including specific cover or shield for exterior vent opening {1}
276.~.~ Wall type {1}
277  DF  .~.~.~> Louver {5}


DEFINITION

Classification: 454/276

Wall type:

(under subclass 275) Subject matter wherein the means is located in a generally planar surface which extends vertically, i.e., parallel to the force of gravity.