US PATENT SUBCLASS 229 / 92.3
.~.~ Window

Current as of: June, 1999
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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

87.01  DF  WRAPPER {17}
92.1  DF  .~ Letter sheets {4}
92.3.~.~ Window

DEFINITION

Classification: 229/92.3

(under subclass 92.1) Subject matter having an opening through which written indicia can be seen.