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| Keywords: Qinghuajian, Suan Biao.jpg en Bamboo slips housed in Tsinghua University This set of slips was a chart for calculation zh 清华 之 算表 ，战国时代的乘法计算工具 2014-03-13 22 32 33 http //news xinhuanet com/tech/2014-01/08/c_125970946 htm People from Warring States Period 476-221 BC Custom license marker 2014 03 13 PD-Art-100 Uploaded with UploadWizard Bamboo slips Warring States Period Mathematical diagrams | ||||
