US PATENT SUBCLASS 379 / 336
.~ With magnet, electromagnet, or relay

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

333  DF  CONCENTRATOR OR TRUNK SELECTOR {4}
336.~ With magnet, electromagnet, or relay

DEFINITION

Classification: 379/336

With magnet, electromagnet, or relay:

(under subclass 333) subject matter wherein the concentrator includes either (a) an electrically excited, or a permanent,

source of magnetic polarization, or (b) a magnetically operated switch.