US PATENT SUBCLASS 370 / 297
Current as of: June, 1999
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(under the class definition) Subject matter for the simultaneous transmission of two messages in the same direction over the same transmission medium.
(1) Note. This subclass is the home for diplex telegraphy.
SEE OR SEARCH THIS CLASS, SUBCLASS:
275, for combination of duplex and diplex means in a quadruplex system.
276+, for a duplex system.