"Signal Group is a modern team, who has advanced competencies in development, production and sales of products.
EPO Signal LLC now has three lines of business: aircraft and space equipment, pressure sensors, gas and gas-fired combustion facilities.
The history of EPO «Signal» LLC is associated with the beginning and development of national space device engineering. In 1918 the first manufacturer of aircraft instruments, namedе «Aviapribor». Plant was built. Its main purpose was to product goods competitive with already experienced American and European companies.
The mass production of instruments began in 1924. 7 years later «Aviapribor » product output was about 80-100% of all produced domestic aircraft instruments.
The Great Patriotic War made adjustments to the company location. To provide safety of the most important defense company in war conditions it was decided to transfer business. On 23 October 1941 the company was relocated to the City of Engels, Saratov Region."