Electronic calculator with memorandum function

Details Electronic calculator with memorandum function Electronic calculator with memorandum function

1987-11-30

1990-06-26

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03088839

REFERENCES:
patent: D258740 (1981-03-01), Matsumoto
patent: D282853 (1986-03-01), Yoshioka et al.
patent: D297547 (1988-09-01), Sasaki
patent: 4697072 (1987-09-01), Kawana

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