US PATENT SUBCLASS 229 / 928
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ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES
(under the class definition) Envelope including means to adjust its size.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1.5, for a file folder.
101+, for a variable volume paperboard box.
SEE OR SEARCH CLASS
383, Flexible Bags,
2, for a bag having a selectively adjustable volume and subclass 120 for a bag having a pleat or gusset.