Electronic calculator with solar cell

Printing and office machinery – Typewriter or calculator – Calculator

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D03174581

REFERENCES:
patent: D241852 (1976-10-01), Sugo
patent: D303679 (1989-09-01), Sakaguchi et al.
patent: D303681 (1989-09-01), Sakaguchi et al.
patent: D303980 (1989-10-01), Yubisui et al.
patent: D309623 (1990-07-01), Sawada et al.
patent: D309747 (1990-08-01), Sakaguchi et al.

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