Calculators

Historical Document · 1976

US Patent 3,979,058: Operator Prompting System for Stored Program Calculator (Specialized Electronics Corp.)

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Prompting the operator for each input in words or lit legends; filed 17 March 1975, granted 7 September 1976.

Author
Ronald C. Katz, Aaron Aronson, Clarence Turek
Year
1976
Type
Historical Document
Credit
US Patent and Trademark Office; via Google Patents.

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US Patent 3,979,058: Operator Prompting System for Stored Program Calculator (Specialized Electronics Corp.)