The Elka 22 was the second Bulgarian electronic calculator produced by ELKA; it was released in 1966 and its serial production began in 1967 in the town of Silistra.
Weighing 8.5 kilograms (18.7 pounds), the Elka 22 has 3 registers and operates with 12 decimal digits.
Addition speed is 0.3 seconds per operation, and division speed is 0.5 seconds.
[1] This calculator has a plastic case, a nixie tube display and its technology is based on numerous phenol boards populated with hundreds of discrete transistors, diodes and resistors, not unlike other calculator models developed around the mid-1960s.
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