Central office coin repeater modification circuit

Details Central office coin repeater modification circuit Central office coin repeater modification circuit

1977-12-30

1979-02-13

Claffy, Kathleen H.

H04M 1702

Patent

active

041397363

ABSTRACT:
There is provided a modification circuit for prepay telephone central office coin repeaters. The modification circuit includes an improved coin detector circuit that may be used with a circuit for providing coin-free dialing for certain predetermined numbers including selected service codes and operator access. The repeater modification circuit is adapted to be connected directly to and mounted with an electromechanical central office coin repeater.

REFERENCES:
patent: 2835738 (1958-05-01), Quatman
patent: 3449524 (1969-06-01), Pharis
patent: 3676597 (1972-07-01), Peterson
patent: 3678203 (1972-07-01), Lorange
patent: 3737576 (1973-06-01), Spencer
patent: 3992588 (1976-11-01), Hunsicker
patent: 4063036 (1977-12-01), Hunsicker

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