The KV type tank that research to manufacture wins in the competition of the heavy type tank from the factory of Kirov in 1939, ising named after KV-1. KV-1 the beginning batch quantity produces in 1942 February, at the beginning of the production model number calls the KV-1 model 1941 "small Turret", first material in KV-1 types L-11s 76.2mm of artillery; July of 1940, the heavy type in the series of KV tank production be transfered by the factory of Kirov the 100 factory production, henceforth the KV-1 that produce all changed to pack better types F-32s in function 76.2mm of artillery.