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File:Qinghuajian, Suan Biao.jpg

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摘要

描述
English: Bamboo slips housed in Tsinghua University. This set of slips was a chart for calculation.
中文：清华简之“算表”，战国时代的乘法计算工具
日期
來源 http://news.xinhuanet.com/tech/2014-01/08/c_125970946.htm
作者 People from Warring States Period (476-221 BC)

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This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain".
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