Telephone intercommunication system incorporating improved diali

Details Telephone intercommunication system incorporating improved diali Telephone intercommunication system incorporating improved diali

1975-03-28

1977-03-01

Cooper, William C.

179 90K, H04M 172

Patent

active

040103315

ABSTRACT:
A telephone intercommunication system where a plurality of stations have access to a plurality of lines. Each station has a pushbutton type keyset which is connectible to integrated circuits associated with each line and are utilized and generate signals for controlling central office switching equipment.

REFERENCES:
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3899638 (1975-08-01), Hahn
patent: 3931477 (1976-01-01), Warman
patent: 3931479 (1976-01-01), Warman et al.
"Advances in the 1A2 Key Telephone System," S. E. Bush, Bell Labs. Record, vol. 48, No. 9, Oct. 1970, pp. 259, 262 and 263.
"104 Key Telephone System," A. Obata and K. Okuno, Japan Telecommunications Review, vol. 13, No. 3, July 1971, pp. 116-118.

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