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...Important eras in the development of computers pre history electronics mini micro era th century b c to s abacus is believed have been invented antikythera mechanism a device used for registering and predicting motion st stars planets dated arabic numerals were introduced europe d was until pictures fragment john napier scotland logs allow multiplication division be converted addition subtraction wilhelm schickard built mechanical calculator with digit capacity machine did work but it never made beyond prototype stage leonardo da vinci now given credit building first around evidence not found papers discovered blaise pascal builds an...