In the beginning of the 1950s, the personnel of the OKB-520 design bureau of the Stalin Ural Tank Factory No. 183 (Uralvagonzavod) had been changed considerably.
Početkom 1950-ih vodstvo OKB-520 dizajn biroa Staljin Ural Tank Factory No. 183 (Uralvagonzavod) se znatno promijenilo.