AKA: Berkey KEYSTONE, Made in U S A, 350, Product number (P/N): 350,
Keywords/Tags: 350 | Berkey KEYSTONE
Date of intro: 1973, Origin: USA (List), Dimensions: 130x80x45mm, Weight: 279g,
Power: 6V: (AA x4) + Adaptor, Adaptor: KEYSTONE_adaptors: 375,
Display: Type = Display (Gas disharge) (List),
Number of keys: 18,
Keyboard Array (Rows x Columns): 05x04,
Decimal switch: [DECIMAL_Normal-$], Miscellaneous switch: [CONSTANT_Normal-K (Blank)-On],
Classification: / Pocket,
Featuring: Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Related with: KEYSTONE_parts: (Box) 350 (version-1); KEYSTONE_parts: (Box) 350 (version-2),
Serie-members: KEYSTONE: 350 (version-1) ('Keystone'-notation, 2 yellow Keys on dark background); KEYSTONE: 350 (version-2) ('Keystone'-notation, No yellow Keys on dark background); KEYSTONE: 350 (version-3) ('Keystone'-notation, 2 blue Keys on dark background); KEYSTONE: 350 (version-4) ('Berkey KEYSTONE'-notation),
Known Serial-numbers: C031589 (List of all S/Ns from KEYSTONE)
Initial Cost Price: USD81.00, Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: VINTAGE CALCULATORS WEB MUSEUM