US PATENT SUBCLASS 379 / 253
.~.~.~ Electronic

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
251  DF  .~ With generating of call associated substation signal {3}
252  DF  .~.~ For alerting signal at called station (e.g., ringing) {3}
253.~.~.~ Electronic

DEFINITION

Classification: 379/253

Electronic:

(under subclass 252) Subject matter having an electric circuit element utilizing an electron discharge device or semiconductor component.