Also, from wikipedia: "The Z1 was a mechanical computer designed by Konrad Zuse from 1935 to 1936 and built by him from 1936 to 1938." and "The Atanasoff–Ber

Also, from wikipedia: "The Z1 was a mechanical computer designed by Konrad Zuse from 1935 to 1936 and built by him from 1936 to 1938." and "The Atanasoff–Berry Computer (ABC) was...conceived in 1937, the machine was not programmable, being designed only to solve systems of linear equations. It was successfully tested in 1942."