Calculator

Details Calculator Calculator

1989-11-02

1991-08-20

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03192539

REFERENCES:
patent: D245125 (1977-07-01), Chou et al.
patent: D283893 (1986-05-01), Fujimoto
patent: 3932895 (1976-01-01), Ward
patent: 4658317 (1987-04-01), Lievsay, Jr.
patent: 4794470 (1988-12-01), Lauffenburger et al.
patent: 4811152 (1989-03-01), Kishine et al.
patent: 4816954 (1989-03-01), Woods

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