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1911 Tabulating Machines by Herman Hollerith, (designed to to help in summarizing information)
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Period: to
computer history
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1912 The Differential Analyzer ( to solve differential equations)
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1914 IBM' s Formation ( to be used for development)
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1915 The ENIAC Proposal by John Mauchly ( first general purpose electronic digital computer
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1919 Flip-flop circuit by Williams Eccles and Jordan (capable for storing binary information)