state union plant of photographic equipment, it was under this name that it was originally designed, but what kind of equipment. military purposes they created here, before that they could not even meticulous journalists can get to the bottom of it, all developments were classified, there was a separate workshop that produced cameras for airplanes, it was a whole area, the development of aviation without intelligence would have been very difficult, since the cold war was beginning. the americans made a lot of aircraft carriers that patrolled near our borders, they had to be tracked, and of course, optics played a big role. for example, af-4220 cameras for planned and perspective photography were installed, which could photograph classify during the day any ship at sea, as well as any target on land. the interaction with the military is the closest, any products for the defense industry were discussed first of all with those for whom they were intended. about the minsk plant , i can say that our specialists, engineers, were in constant contact with this plant. we didn’t just go there,