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The world's earliest digital computer was called the Z3 machine and was invented by Konrad Zuse, a German inventor and engineer. This machine, however, was shortly lost in a bombing raid of Germany in World War II.
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The first digital computer that came about in the United States was made by John Vincent Atanasoff and his graduate student Clifford Berry. They named the computer the Atanasoff-Berry Computer (ABC). It was significant due to its memory system and processing speed, performing one function in 15 seconds.
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The ENIAC stands for the Electronic Numeric Integrator and Calculator. Created by professors John Mauchly and J. Presper Eckert, the ENIAC was designed to be a digital, electronic, decimal computer for general purposes.
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Created by the same two professors as the ENIAC, they are funded by the Census Bureau to create the UNIVAC, a commercial computer useful to business and government operations.
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While previous computers required vacuums that took up a lot of space, William Shockley, John Bardeen, and Walter Brattain invented an electric switch to take their place in the transistor.