Historical Document · 1977

US Patent 4,041,295: Electronic Timepiece Calculator (Suwa Seikosha)

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Priority 7 November 1973, granted 9 August 1977: a calculator watch with a reduced keyboard, the time-setting keys doubling as calculator keys.

Author

Ido, Maruyama

Year

1977

Type

Historical Document

Credit

US Patent and Trademark Office; via Google Patents.

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