US PATENT SUBCLASS 379 / 163
.~.~ Electronic


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

156  DF  MULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTION {7}
162  DF  .~ Detail of hold circuitry {1}
163.~.~ Electronic


DEFINITION

Classification: 379/163

Electronic:

(under subclass 162) Subject matter having a discharge or solid state device.