Direct readout exhibitor for determining long distance telephone

Details Direct readout exhibitor for determining long distance telephone Direct readout exhibitor for determining long distance telephone

1974-05-08

1976-06-08

Claffy, Kathleen H.

58152T, H04M 1518

Patent

active

039625486

ABSTRACT:
A changeable exhibitor incorporating a timing device displays, as a function of time indicating intervals, a direct visual readout of the telephone charges for a direct dial call between any two points in the continental United States.

REFERENCES:
patent: 2075056 (1937-03-01), Rich
patent: 2216528 (1940-10-01), Willis
patent: 2584997 (1952-02-01), Ferguson
patent: 2629781 (1953-02-01), Feinstein
patent: 2917325 (1959-12-01), Sines
patent: 3136858 (1964-06-01), Conviser et al.
patent: 3673793 (1972-07-01), Barnard
patent: 3767862 (1973-10-01), Grushow

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