Electronic calculator

Details Electronic calculator Electronic calculator

1987-10-27

1990-06-19

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03086925

REFERENCES:
patent: D260776 (1981-09-01), Yoshioka et al.
patent: D269356 (1983-06-01), Yoshioka et al.
patent: D298623 (1988-11-01), Yubisui et al.

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