Electronic calculator

Printing and office machinery – Typewriter or calculator – Calculator

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D03140040

REFERENCES:
patent: D258740 (1981-03-01), Matsumoto
patent: D273307 (1984-04-01), Yamagami
patent: D282853 (1986-03-01), Yoshioka et al.
patent: D287507 (1986-12-01), Yoshioka et al.
patent: D287508 (1986-12-01), Yoshioka et al.
patent: D297547 (1988-09-01), Sasaki
patent: 4697072 (1987-09-01), Kawana
Office Products Dealer (OPD), Jul. 1985; p. 77; lower left corner.
Hong Kong Enterprise; 9/1985; p. 300; #601 lower left side.

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