Desk-top electronic calculator

Printing and office machinery – Typewriter or calculator – Calculator

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D02985454

REFERENCES:
patent: D256694 (1980-09-01), Kitai
patent: D268423 (1983-03-01), Yoshioka et al.
patent: D289416 (1987-04-01), Yoshioka et al.
patent: D290018 (1987-05-01), Hirooka et al.
patent: 4558427 (1985-12-01), Takeuchi et al.

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