US PATENT SUBCLASS 379 / 48
.~ Announcement or alarm received at terminal station (e.g., "butt-in", alarm)

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

37  DF  EMERGENCY OR ALARM COMMUNICATIONS (E.G., WATCHMAN'S CIRCUIT) {9}
48.~ Announcement or alarm received at terminal station (e.g., "butt-in", alarm)

DEFINITION

Classification: 379/48

Announcement or alarm received at terminal station (e.g., "butt-in", alarm):

(under subclass 37) Subject matter which enables a central station (a) to interrupt normal telephone communication to make an announcement to, or (b) to actuate an alarm at, a terminal station.