Telephone intercommunication system provided with a common commu

Details Telephone intercommunication system provided with a common commu Telephone intercommunication system provided with a common commu

1974-09-19

1976-01-06

Robinson, Thomas A.

179 99, H04M 100

Patent

active

039314782

ABSTRACT:
A private telephone intercommunication system including facilities for connecting the system to a telephone central office. Means are included and restrict internal calls to only two stations to insure privacy.

REFERENCES:
patent: 3576397 (1971-04-01), Pell et al.
patent: 3843845 (1974-10-01), Ridley
patent: 3860763 (1975-01-01), Sudoh et al.

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