FAG was made by factory Geodezia which also made aerial cameras. In 1941 it was evacuated from St. Petersburg, already under different name, to Ural mountain region to city of Sverdlovsk. It was making production for the war after the move. In 1949 it was repurposed from optico-mechanical factory into a radio-radar factory. Currently it exists under name of "Vektor".
Here's the site and some history if anyone is interested in running Google translate if you don't read Russian. http://www.vektor.ru/o_predpriyatii/istoriya
Cheers,
Vlad.
11/20/2014 19:02