US PATENT SUBCLASS 379 / 160
.~.~ With connection of intercom station to subscriber line

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}
159  DF  .~ With intercom system {1}
160.~.~ With connection of intercom station to subscriber line

DEFINITION

Classification: 379/160

With connection of intercom station to subscriber line:

(under subclass 159) Subject matter including connecting an intercom instrument to a public telephone line.