US PATENT SUBCLASS 379 / 165
.~ Switching or supervision feature (e.g., common control, digital)

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}
165.~ Switching or supervision feature (e.g., common control, digital)

DEFINITION

Classification: 379/165

Switching or supervision feature (e.g., common control, digital):

(under subclass 156) Subject matter which provides for connection control or signalling within a telephone key system.