US PATENT SUBCLASS 49 / 144
.~.~ One slides up to close, other vents about vertical axis

Current as of: June, 1999
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49 /   HD   MOVABLE OR REMOVABLE CLOSURES

142  DF  PLURAL CLOSURES, EACH WITH INDEPENDENT DIVERSE MOVEMENT {1}
143  DF  .~ One sliding and other swinging {2}
144.~.~ One slides up to close, other vents about vertical axis

DEFINITION

Classification: 49/144

(under subclass 143) Devices wherein the sliding closure moves vertically to an elevated passage blocking position and the swinging closure or turns about a vertically oriented pivot to provide a ventilating slot or opening at an upright edge of the closure.