AKA: Scientific calculator, EL-509, AUTO POWER OFF, AKA (Label): ELECTRONIC CALCULATOR, EL-509, Product number (P/N): EL509 (EL-509),
Keywords/Tags: EL509 (EL-509) | 509 | Scientific Calculator
Date of intro: ~feb-1981, Origin: Japan (List), Dimensions: 115x65x8mm, Weight: 60g,
Power: 3V: (LR44 x2),
Display: Type = Display (LCD) (List), Digits = 5+1+(2+1),
Number of keys: 35,
Keyboard Array (Rows x Columns): 07x05,
Classification: / Pocket,
Featuring: Scientific functions, Square root, PI, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Patents: 3902169(US); 3976994(US),
Related with: SHARP_docu: (Cat.) 198202 (Japanese); SHARP_docu: (Cat.) 198110 (Japanese),
Initial Cost Price: 4700 JPY (€ 38,07), Collector value: 7/10,
Courtesy of: STROUP David,