AKA (Label): DESK TOP ELECTRONIC CALCULATOR, TYPE KK, FORM 521, ND178, Product number (P/N): ND178,
Keywords/Tags: ND178 | KK521 | DESK TOP ELECTRONIC CALCULATOR
Date of intro: ~1971,
Power: AC,
Display: Type = Display (Nixie) (List), Digits = 12,
Number of keys: 22, #Key-Blue: 3, #Key-Grey: 4, #Key-Red: 3, #Key-White: 12,
Keyboard Array (Rows x Columns): 04x07, Keyboard Layout: [CI] [7] [8] [9] [M1+] [M1-] [RM1] - [CM1] [4] [5] [6] [x] [(Division)] - [C] [1] [2] [3] [+=] [R] - [0] [.] [-=],
Classification: / Desktop with Display,
Serie-members: HITACHI: KK521 (version-1) (Display with Nixie-tubes); HITACHI: KK521 (version-2) (Display with VFD-tubes),
Known Serial-numbers: P162022069 (P 162022069) | P302422169 (P 302422169) (List of all S/Ns from HITACHI)
Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),