Conversion device

Details Conversion device Conversion device

1981-08-03

1984-06-05

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D02741806

REFERENCES:
patent: D144355 (1946-04-01), Carduner et al.
patent: 2385452 (1945-09-01), Lande
patent: 2531633 (1950-11-01), Laurin
patent: 3650467 (1972-03-01), Sellie

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