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The Z4 was the successor of the Z3 which was the world's first working programmable, fully automatic digital computer. Both machines were invented by the German engineer Konrad Zuse from 1935-1941 (Z3) and 1942-1945 (Z4).

During the latter period, Zuse also created "Plankalk├╝l", the first high-level programming language to be designed for a computer.




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