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          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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