Then and now: Charting growth of communication tools

        

      

      

        
          
          chinadaily.com.cn |
          Updated: 2018-05-15 14:12
          
          
          
          
        


        
      

      

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   Manual switching telephones — people had to send an electrical signal by hand rolling the microgenerator to the switchboard and then connect to the number they wanted to dial. [Photo/IC] 
 
 

 

        


        
        
      

        
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