Historical Document · 1976

US Patent 3,955,074: Calculator with Keys Having More Than One Function Assigned (Hewlett-Packard, HP-80)

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HP-80 divisional on the shift key; granted 4 May 1976.

Author

Rodé, Crowley, Walker

Year

1976

Type

Historical Document

Credit

US Patent and Trademark Office; via Google Patents.

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