US PATENT SUBCLASS 454 / 271
.~.~ Wall type

Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
270  DF  .~ Sleeved vent for ceiling, wall, or floor (e.g., thimble) {1}
271.~.~ Wall type {2}
272  DF  .~.~.~> With air pump
273  DF  .~.~.~> Having adjustable valve {1}

DEFINITION

Classification: 454/271

Wall type:

(under subclass 270) Subject matter wherein the barrier is a generally planar surface which extends vertically (i.e., parallel to the force of gravity).

(1) Note. This and indented subclasses include many bank-vault ventilators.