Helec GT 539 (tip-in)

The Helec GT 539 is an arithmetic calculator with algebraic logic. It has 5 functions, 22 keys, and an LED (light-emitting diode) display, typical of calculators of this era.

Facts at a glance:

Feature Value
Type: Arithmetic
Functions: 5
Keys: 22
Logic: Algebraic
Display type: LED
Year introduced: 1975

See other calculators by Helec