Telephone call cost determining device

Details Telephone call cost determining device Telephone call cost determining device

1978-03-20

1980-02-05

Lucas, Susan J.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02541416

REFERENCES:
patent: 3002684 (1961-10-01), Luscher
Datamation, 10-1975, p. 129-Desktop Computer.

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