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          Blast from the past: Old objects show changes in 70 yrs
          
        
          
      
          
      
          
        
          
          chinadaily.com.cn |
          Updated: 2019-08-27 13:30
          
          
          
          
        


        
      
          
      
          
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   Abacuses used in the 1960s and 1970s are seen in Caoxian county, Shandong province, July 7, 2019. [Photo/IC] 
 
           

           

          
        
          

        
        
      
          
        
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