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US patent history reviewed at a touring model exhibition

Updated: 2018-05-15 10:38:05

( chinadaily.com.cn )

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The Spirit of Inventionbrings models designed and made by 19th-century inventors who attempted to bring changes to every aspect of life, from a sewing machine, a wool scissoring machine, a printer to an engine. [Photo by Xiao Fei/China Daily]

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