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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