US PATENT SUBCLASS 229 / 92.9
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ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES
(under the class definition) Subject matter comprising devices to receive coins and analogous articles for transmission through the mails and prevent them from moving in the package while in transit.
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72, and 87.5, for envelopes and wrappers having compartments and pockets which may be used for receiving coins.