Electronic time switching telephone system

Details Electronic time switching telephone system Electronic time switching telephone system

1975-01-21

1976-08-24

Libman, George H.

179 15BD, 179 27FE, H04M 320

Patent

active

039768414

ABSTRACT:
Electronic time switching telephone system so that the operator can listen in, with the ability to break-in and talk to the correspondents connected to the corresponding exchange, the system comprises an interface modem between the operator's line transformer and the connection network.

REFERENCES:
patent: 3435150 (1969-03-01), Albrecht
patent: 3769461 (1973-10-01), Lewis
patent: 3828146 (1974-08-01), Lewis

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