Electrical calculator having the functions of telephone book, ad

Printing and office machinery – Typewriter or calculator – Combined

Patent

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Details

D18 7, 1801

Patent

active

D03861996

REFERENCES:
patent: D255125 (1980-05-01), Hazama et al.
patent: D258892 (1981-04-01), Ohie et al.
patent: D306298 (1990-02-01), Sawada et al.
patent: D317921 (1991-07-01), Suzuki
patent: D370213 (1996-05-01), Iwamoto et al.

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