US PATENT SUBCLASS 379 / 161
.~ With exclusion or priority feature (e.g., lockout or privacy)

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}
161.~ With exclusion or priority feature (e.g., lockout or privacy)

DEFINITION

Classification: 379/161

With exclusion or priority feature (e.g., lockout or privacy):

(under subclass 156) Subject matter where use of one terminal on a particular line denies or cuts off access of another terminal to the line.