The hasty evacuation of the industry that was conducted in the USSR in 1941 and 1942 was accompanied by the inevitable loss of manufacturing equipment, especially bulky machinery. For example, they were unable to evacuate the unique turning-and-boring mills from Kharkov, which were capable of machining turret rings with a diameter larger than 1,500mm, and in the USSR such machine tools weren’t produced. That was the main reason why the two-man turret was kept for a long time on the T-34