Combined electronic calculating machine and timepiece

Printing and office machinery – Typewriter or calculator – Calculator

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D1801

Patent

active

D02609045

REFERENCES:
patent: D236353 (1975-08-01), Link
patent: D238951 (1976-02-01), Herr et al.
patent: D248994 (1978-08-01), Ikeda
patent: 4208720 (1980-06-01), Harrison
Evans 1978 Catalog, pp. 202-204, Item B, Calculator.

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