US PATENT SUBCLASS 379 / 227
.~.~ With an automatic exchange

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


379 /   HD   TELEPHONIC COMMUNICATIONS

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
226  DF  .~ Having a manual exchange {1}
227.~.~ With an automatic exchange {1}
228  DF  .~.~.~> Having signalling to operator

DEFINITION

Classification: 379/227

With an automatic exchange:

(under subclass 226) Subject matter further including an exchange which switches calls in response to a call address signal.