Multi-function programmable electronic calculator

Details Multi-function programmable electronic calculator Multi-function programmable electronic calculator

1989-06-26

1991-06-25

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D18 1

Patent

active

D03177807

REFERENCES:
patent: D243250 (1977-02-01), Hazama
patent: D279107 (1985-06-01), Kikuchi et al.
patent: D279688 (1985-07-01), Kitai et al.
patent: D285805 (1986-09-01), Yubisui et al.
patent: D301895 (1989-06-01), Hayashi
patent: D304930 (1989-12-01), Hongo et al.
patent: D305535 (1990-01-01), Sakaguchi et al.
patent: D309601 (1990-07-01), Sawada et al.
patent: D309749 (1990-08-01), Ido

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