Eniac was announced in 1946. Incidentally Turing wanted to be build one in 1945, called Electronic Brain. His paper "on computable numbers" was published in 1936.
[1] http://en.wikipedia.org/wiki/Konrad_Zuse [2] http://en.wikipedia.org/wiki/Z3_%28computer%29 [3] http://en.wikipedia.org/wiki/Plankalk%C3%BCl