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John Mauchly and J. Presper Eckert, build the Electronic Numerical Integrator and Calculator (ENIAC). (jan 1, 1942 – jan 1, 1943)

Description:

Considered the grandfather of digital computers, it fills a 20-foot by 40-foot room and has 18,000 vacuum tubes.

Added to timeline:

Date:

jan 1, 1942
jan 1, 1943
~ 12 months