US PATENT SUBCLASS 229 / 72
Current as of:
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ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES
(under subclass 68) Envelopes having more than one pocket, but not so formed as to avoid any liability of opening the
pockets if an attempt is made to separate them. The envelope may be made from one blank or more than one blank, and it is not essential that all the pockets have closing means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
69, for plural, connected envelopes.