Calculator case

Printing and office machinery – Typewriter or calculator – Calculator

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1801

Patent

active

D03926699

REFERENCES:
patent: D257512 (1980-11-01), Barner et al.
patent: D309471 (1990-07-01), Perelli et al.
patent: D333315 (1993-02-01), Sereika et al.

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