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Background an Information ¶ 

The HP-31C series of calculators brought about a revolution in calculator technology, introducing the first alphanumeric LCD screen. In addition to providing specific error messages and feedback, the HP-41C had programmable keys so the user could completely customize their calculator.

Additional Information ¶ 

Wikipedia: HP-41C

Museum of HP Calculators: HP-41C/CV/CX

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