Product number (P/N): 21,
Keywords/Tags: 21
Date of intro: 1975, Origin: Singapore (List), Dimensions: 130x68x30mm,
Power: Rechargeable,
Display: Type = Display (LED) (List), Digits = 12,
Number of keys: 30, #Key-Black: 13, #Key-Blue: 1, #Key-White: 16,
Miscellaneous switch: [OFF-ON DEG-RAD],
Classification: / Pocket / RPN (Reverse Polish Notation),
Featuring: Scientific functions, Square root, PI,
Related with: HP_parts: 82019A (Battery holder); HP_parts: 82019B (Battery pack Rechargeable); (Docu_Mags): 197601: ELECTRONICS TODAY INTERNATIONAL; (Docu_Catalogs): EATON: 197512 Christmas; HP_parts: (Box) 21,
Known Serial-numbers: 1505A60202 | 1506S10727 | 1507S02177 | 1507S21880 | 1601S22729 | 1709S36742 (List of all S/Ns from HP_calcs)
Initial Cost Price: USD125.00, Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: EARLY ELECTRONIC CALCULATOR TECHNOLOGY REFERENCE