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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