Kirov Plant
In the spring of 1941 the director of the Kirov Plant (LKZ) was instructed by a decree of the NKO of the USSR to work on a design of a new tank with two guns, 125-130 mm armor of the frontal part of the hull. This new tank was intended to use the new 107mm ZiS-6 gun which was being developed at Plant #92, and the 45mm 20-K gun as a secondary armament