US PATENT SUBCLASS 49 / 355
.~.~ With weather seal or flap for drive element

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

324  DF  WITH OPERATOR FOR MOVABLY MOUNTED CLOSURE {12}
354  DF  .~ Through wall type {1}
355.~.~ With weather seal or flap for drive element

DEFINITION

Classification: 49/355

(under subclass 354) Device provided with means to close or reduce the area of the transverse passage to prevent or reduce the flow of ambient air or moisture therethrough.