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US patent history reviewed at a touring model exhibition

By Lin Qi | chinadaily.com.cn | Updated: 2018-05-15 10:38
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The Spirit of Invention brings 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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