US PATENT SUBCLASS 454 / 213
.~ Having air passage at window top

Current as of: June, 1999
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454 /   HD   VENTILATION

196  DF  MEANS COMBINED WITH WINDOW {12}
213.~ Having air passage at window top

DEFINITION

Classification: 454/213

Having air passage at window top:

(under subclass 196) Subject matter wherein the means is located at an upper portion of the window.