Tondi Elektroonika

Under this name, the company operated in all its glory to the formation of Tondi electronics in 1991.

[citation needed] The factory has manufactured photoresistors, varistors, transistors, thyristors and microchips.

From 1959 to 1978, the factory manufactured temperature-sensitive photoresistors 04-AN (in Cyrillic: 04-АН) for use in Soviet military rocket guidance systems.

Since 1979, an important — and by 2008, the main — line of production has been hearing aids, peaking in 1989 at 176,500 units manufactured.

[citation needed] The mixed choir Helitron was initially set up to cater to employees of Tondi Elektroonika.