US PATENT SUBCLASS 379 / 226
.~ Having a manual exchange

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

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

DEFINITION

Classification: 379/226

Having a manual exchange:

(under subclass 219) Subject matter wherein at least one of the plural exchanges has manual call connection.