Electronic calculator with solar cell

Details Electronic calculator with solar cell Electronic calculator with solar cell

1999-11-10

2000-10-31

Veynar, Caron D.

Printing and office machinery

Typewriter or calculator

Calculator

1801

Patent

active

D04330595

REFERENCES:
patent: D257976 (1981-01-01), Schmidt
patent: D309623 (1990-07-01), Sawada et al.
patent: D312833 (1990-12-01), Kobayashi
patent: D314396 (1991-02-01), Hayashi

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