US PATENT SUBCLASS 379 / 182
.~ Automatic or unattended

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

177  DF  POLYSTATION LINE SYSTEM (I.E., PARTY LINE) {6}
182.~ Automatic or unattended {2}
183  DF  .~.~> Station identification
184  DF  .~.~> Lockout

DEFINITION

Classification: 379/182

Automatic or unattended:

(under subclass 177) Subject matter including a switching exchange for performing call connection solely in response to a call address signal.