When did Hitler's dictatorship in Germany end?
After he killed himself during the Allied invasion in 1945.
A dictatorship is a definition of a state in wich the government has 'dictates' its will. This definition includes the former Soviet union, Khadaffi's regime and Hitlers nazi Germany. These regimes were dictatorships although they regularly (some) held votes. So the right to vote has nothing to do with the definition of a dictatorship.