1 янв 30 г. до нашей эры - Oldest Counting Board

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The Salamis Tablet (dates to 300BC) is the oldest known counting board discovered thus far. Certainly not the first, but it is the first and only fully preserved counting board of its kind, found in Greece.

Stephenson, Stephen Kent (July 2013), Ancient Computers, Part I - Rediscovery (2 ed.), ISBN 1490964371

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