In 1963-1964, mass production of the T-64 tank began. This machine has been in service for 50 years, breaking all conceivable records of "longevity," becoming the ancestor of the family of main battle tanks and a "pioneer" in the development of revolutionary concepts and technologies. It was on the "sixty-four" for the first time that all the novelties of domestic tank building were tested, which were then introduced on the T-72 and T-80: combined armor, mechanized loading of the gun, the ability to fire anti-tank guided missiles through the barrel of a standard gun, compact on-board gearboxes, etc.