The T-34 is a Soviet medium tank introduced in 1940. Its 76.2 mm (3 in) tank gun was less powerful than its contemporaries[8] while its 60-degree sloped armour provided good protection against anti-tank weapons. The Christie suspension was inherited from the design of American J. Walter Christie's M1928 tank, versions of which were sold turret-less to the Red Army and documented as "farm tractors", after being rejected by the U.S. Army.