Intercommunication and alarm telephone system

Details Intercommunication and alarm telephone system Intercommunication and alarm telephone system

1976-11-05

1978-06-27

Claffy, Kathleen H.

179 5R, 179 1H, H04M 1100

Patent

active

040976904

ABSTRACT:
An intercommunication and alarm telephone system has a common control in the form of a clock driven central unit connected to an alarm control unit and one telephone line shared by a plurality of station units. The central control unit provides means for answering and placing outside telephone calls to a central telephone office, holding and transferring such calls, giving paging and intercom services, excluding and locking out other stations from outside calls, giving suitable alarms, and such other services as may be necessary or desirable.

REFERENCES:
patent: 3842208 (1974-10-01), Paraskevakos
patent: 3936602 (1976-02-01), Korver
patent: 4022985 (1977-05-01), Tanaka
patent: 4027110 (1977-05-01), Takematsu

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