US PATENT SUBCLASS 229 / 122.22
.~.~ One of the walls is made of wood, metal, or rigid thermoplastic material


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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

100  DF  PAPERBOARD BOX {54}
122.21  DD  .~ Box includes two side walls which are not formed from the same piece of box material {3}
122.22.~.~ One of the walls is made of wood, metal, or rigid thermoplastic material