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The bullae were in the 5th-4th Millennia B.C. what we now call a «cheque-invoice»; they were clay bags, more or less rounded, full of different clay figures which represented currency, and were sealed on the outside as a symbol of the trade operations, in the context of a complex accounting system, which we can consider as the forerunners of the famous cuneiform tablets, and therefore of writing. According to all the encyclopaedias, the red Temple at Uruk, the oldest Sumerian bank, for the time being, which we know through archaeology, has complete bank files lasting 200 years (-3400 to -3200).