1937-1941 - the first electronic calculating machine was constructed in, 2700 BC - The Sumerian abacus apeared around, Sumer - The first abacus apeared in, Blaise Pascal - The first mechanical calculator was invented by, 1641 - The first mechanical calculator was invented in, John Atanasov - the first electronic calculating machine was constructed by, arithmometer - The first mass-produced calculating machine was called, 1841 - The first mass-produced calculating machine was designed in, 1613 - word "computer" used for the first time in , Richard Brathwait - word "computer" used for the first time by ,

Working memory - History of computing

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