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Prior to the invasion of the Soviet Union during World War II, the German armed forces were not aware of two newly developed Soviet tanks, the T-34 and the KV-1. As a result, they were surprised when they met them in combat for the first time in June 1941. The Germans' standard anti-tank weapons were found to be ineffective against these new Soviet vehicles.
If the Abwher managed to steal a blueprint of the two in,lets say,1940,this could change anything?