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| View Original: | Ming_suanpan.JPG (1647x2187) | |||
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| Keywords: Ming suanpan.JPG zh-hans 程大位算法统宗 算盘图 en Ming dynasty Cheng Dawei's suanpan diagram own my book 程大位（1533-1606） 1592 Chinese abacus PD-old-100 | ||||
