US PATENT SUBCLASS 229 / 929
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ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES
(under the class definition) Envelope including means to facilitate or enable entrapped air to escape.
SEE OR SEARCH THIS CLASS, SUBCLASS:
120, for a paperboard box having venting means.
SEE OR SEARCH CLASS
383, Flexible Bags,
100+, for a bag having venting means.