Telephone intercommunication system providing common access to a

Details Telephone intercommunication system providing common access to a Telephone intercommunication system providing common access to a

1974-09-19

1976-01-06

Robinson, Thomas A.

179 99, H04M 100

Patent

active

039314790

ABSTRACT:
A private telephone intercommunication system including facilities for connecting the system to a telephone central office. Common supervisory means are provided to control access to a line from each station.

REFERENCES:
patent: 3342944 (1967-09-01), Barbato et al.
patent: 3576397 (1971-04-01), Pell et al.
patent: 3703611 (1972-11-01), Kiyomiya et al.
patent: 3843845 (1974-10-01), Ridley
patent: 3860763 (1975-01-01), Sudoh et al.

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