US PATENT SUBCLASS 52 / 204.52
.~.~ With a plug

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

204.5  DF  WINDOW OR WINDOW SASH, SILL, MULLION, OR GLAZING {13}
209  DF  .~ Having a drain or vent {1}
204.52.~.~ With a plug

DEFINITION

Classification: 52/204.52

With a plug:

(under subclass 209) Drain or vent in which a distinct device closes the sash or window frame fluid conveying means.