US PATENT SUBCLASS 229 / 164.2
.~ Flexible or flaccid, internal, non-bag lining formed from an initially separate sheet of material


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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

100  DF  PAPERBOARD BOX {54}
164.2.~ Flexible or flaccid, internal, non-bag lining formed from an initially separate sheet of material