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In an attempt to replace the obsolete T-26 at BT tanks, the Soviets designed the A-20 with experience from the BT-SV. Its 45mm gun and sloped 20mm of armor was deemed too little. So a second prototype, the A-32 was made, with a 76mm gun and 32mm of sloped armor yet it was equally mobile. This was the predecessor of the T-34.