.~ Forming by opening or setting up collapsed receptacle {6}
569
.~.~ Letter-type envelope
DEFINITION
Classification: 53/569
Letter-type envelope:
(under subclass 564) Apparatus in which the receptacle (a) has sides contacting opposite portions of the contents which sides are connected by a single fold or crease and (b) is closed by a single triangular flap.
(1) Note. The receptacle may be used to enclose postal matter for mailing.
SEE OR SEARCH THIS CLASS, SUBCLASS:
266.1, for apparatus for filling and closing envelopes.
376.3+, for devices for closing envelopes.
SEE OR SEARCH CLASS
156, Adhesive Bonding and Miscellaneous Chemical Manufacture, 441.5, for devices for sealing envelopes.