Product number (P/N): 131,
Keywords/Tags: 131
Date of intro: -1978, Origin: Bulgaria (List),
Power: 6V: (AA x4) + Adaptor,
Display: Type = Display (VFD) (List),
Number of keys: 20,
Classification: / Pocket,
Featuring: Procent, Square root,
Serie-members: ELKA: 131 (version-1) (Orange); ELKA: 131 (version-2) (Yellow),
Collector value: 8/10,