Telephone intercommunication systems

Details Telephone intercommunication systems Telephone intercommunication systems

1974-09-19

1976-01-06

Robinson, Thomas A.

179 1H, 179 18AD, H04M 300

Patent

active

039314774

ABSTRACT:
A private telephone intercommunication system including facilities for connecting the system to a telephone central office. Separate communication channels and supervisory means are provided for external and internal calls.

REFERENCES:
patent: 3342944 (1967-09-01), Barbato et al.
patent: 3576397 (1971-04-01), Pell et al.
patent: 3843845 (1974-10-01), Ridley

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