Calculator case

Details Calculator case Calculator case

1987-10-13

1990-07-24

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D18 7

Patent

active

D03094715

REFERENCES:
patent: D218994 (1970-10-01), Suganoya
patent: D224273 (1972-07-01), Yamamoto
patent: D233442 (1974-10-01), Saito
patent: D247198 (1978-02-01), Ohie
patent: D257513 (1980-11-01), Sereika et al.

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