US PATENT SUBCLASS 454 / 210
.~.~.~ With extensible side panel

Current as of: June, 1999
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454 /   HD   VENTILATION

196  DF  MEANS COMBINED WITH WINDOW {12}
200  DF  .~ With air pump {5}
208  DF  .~.~ Propeller fan having rotary axis perpendicular to window {2}
210.~.~.~ With extensible side panel

DEFINITION

Classification: 454/210

With extensible side panel:

(under subclass 208) Subject matter comprising a partition or screening element attached to the apparatus and moved laterally to close or block a window opening between a window frame and the air pump.