Telephone private branch exchange system

Details Telephone private branch exchange system Telephone private branch exchange system

1973-06-18

1976-03-16

Cooper, William C.

H04Q 358

Patent

active

039447510

ABSTRACT:
Telephone automatic switching unit for semi-public use, serving private subscribers and permitting communication by at least a portion of the subscribers via the public communication network by either direct connection of the network, or by means of operators, the subscribers being associated with either one or several different enterprises. The automatic switching unit includes a connecting network, a central control member or a processing unit, registers, senders, and incoming and outgoing circuits for providing communication between subscribers as well as connection with the public network.

REFERENCES:
patent: 3115552 (1963-12-01), Fulwiler et al.
patent: 3180941 (1965-04-01), Williford
patent: 3180942 (1965-04-01), Matthews
patent: 3268669 (1966-08-01), Vigliante et al.
patent: 3306983 (1967-02-01), Goodwin et al.

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