US PATENT SUBCLASS 379 / 335
.~ Using crossbar or crosspoint switching

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379 /   HD   TELEPHONIC COMMUNICATIONS

333  DF  CONCENTRATOR OR TRUNK SELECTOR {4}
335.~ Using crossbar or crosspoint switching

DEFINITION

Classification: 379/335

Using crossbar or crosspoint switching:

(under subclass 333) Subject matter wherein the connection is performed either by a rectangular switch array or a selective plural stage switch having plural horizontal and vertical contact paths.

SEE OR SEARCH THIS CLASS, SUBCLASS:

291+, for crosspoint switching structure in a common control system.

306, for crosspoint switch detail in a centralized switching system.