![U.S. patent history reviewed at a touring model exhibition(2/6)](http://www.ecns.cn/hd/2018/05/15/fc532294f6c6475fab8b985ac2d56857.jpg)
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/China Daily)
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/China Daily)