US PATENT SUBCLASS 229 / 117.28
.~.~ Including a paperboard liner

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

100  DF  PAPERBOARD BOX {54}
117.27  DD  .~ With inner flexible or flaccid bag liner {6}
117.28.~.~ Including a paperboard liner