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当前 | 2008年8月8日 (五) 17:32 | 457 × 876(159 KB) | zhwiki>PericlesofAthens | {{Information |Description=The oldest known illustration of an endless power-transmitting chain drive. This was illustrated in 1092, during the Song Dynasty, by the Chinese engineer Su Song in his book ''Xinyi Xiangfayao''. It was called the "celestial la |
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