Calculator

Printing and office machinery – Typewriter or calculator – Calculator

Patent

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Details

D14159, D18 11

Patent

active

D03294501

REFERENCES:
patent: D258664 (1981-03-01), Bellini
patent: D258827 (1981-04-01), Chin
patent: D269276 (1983-06-01), Sawada et al.
patent: D269780 (1983-07-01), Doodson
patent: D282376 (1986-01-01), Kikuchi et al.

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