Hand held calculator

Printing and office machinery – Typewriter or calculator – Calculator

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D1801

Patent

active

D02621193

REFERENCES:
patent: D117345 (1939-10-01), Binks
patent: D232943 (1974-09-01), Maeda
Scientific American, 11/1974, vol.231, No. 5, p. 11-Litronix Calculator at top center.
Merchandising, 6/76, p. 89-Sinclair Oxford Line at top right center.

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