CH252653A 
                (en )
               
            
            
           
          
            1948-01-15 
            
            
           
          
  Circuit arrangement in telecommunications systems.
 
      
         
        
          
             
              
                CH225893A 
                (en )
               
            
            
           
          
            1943-02-28 
            
            
           
          
  Button for telecommunications, in particular telephone systems.
 
      
         
        
          
             
              
                CH283265A 
                (en )
               
            
            
           
          
            1952-05-31 
            
            
           
          
  Automatic telephone switchboard.
 
      
         
        
          
             
              
                CH241318A 
                (en )
               
            
            
           
          
            1946-02-28 
            
            
           
          
  Circuit arrangement in telephone systems with coin tellers for network group traffic.
 
      
         
        
          
             
              
                CH274625A 
                (en )
               
            
            
           
          
            1951-04-15 
            
            
           
          
  Telephone subscriber station.
 
      
         
        
          
             
              
                CH233692A 
                (en )
               
            
            
           
          
            1944-08-15 
            
            
           
          
  Circuit arrangement in telecommunication systems, in particular telephone systems.
 
      
         
        
          
             
              
                CH235159A 
                (en )
               
            
            
           
          
            1944-11-15 
            
            
           
          
  Circuit arrangement with pay phone for network group traffic.
 
      
         
        
          
             
              
                CH245547A 
                (en )
               
            
            
           
          
            1946-11-15 
            
            
           
          
  Circuit arrangement in telephone systems with several exchanges.
 
      
         
        
          
             
              
                CH231156A 
                (en )
               
            
            
           
          
            1944-02-29 
            
            
           
          
  Circuit arrangement in telephone systems with connecting lines equipped with several branch points.
 
      
         
        
          
             
              
                CH266244A 
                (en )
               
            
            
           
          
            1950-01-15 
            
            
           
          
  Two-way circuit for telephone systems.
 
      
         
        
          
             
              
                DK73732C 
                (en )
               
            
            
           
          
            1952-02-04 
            
            
           
          
  Signaling systems, in particular telephone systems with registers.
 
      
         
        
          
             
              
                CH236495A 
                (en )
               
            
            
           
          
            1945-02-15 
            
            
           
          
  Payphones, in particular for network group traffic.
 
      
         
        
          
             
              
                CH228350A 
                (en )
               
            
            
           
          
            1943-08-15 
            
            
           
          
  Circuit arrangement for counting connections of different values in telecommunications, in particular telephone systems.
 
      
         
        
          
             
              
                CH258725A 
                (en )
               
            
            
           
          
            1948-12-15 
            
            
           
          
  Remote switchable self-connection telephone for noisy traffic.
 
      
         
        
          
             
              
                CH225671A 
                (en )
               
            
            
           
          
            1943-02-15 
            
            
           
          
  Circuit arrangement in telephone systems, in particular private branch exchanges, with several centers.
 
      
         
        
          
             
              
                CH237889A 
                (en )
               
            
            
           
          
            1945-05-31 
            
            
           
          
  Circuit arrangement in telephone systems with main and sub-offices.
 
      
         
        
          
             
              
                CH240685A 
                (en )
               
            
            
           
          
            1946-01-15 
            
            
           
          
  Subscriber call facility in electro-acoustic transmission systems.
 
      
         
        
          
             
              
                CH237098A 
                (en )
               
            
            
           
          
            1945-03-31 
            
            
           
          
  Circuit arrangement in telephone systems with several exchanges in series.
 
      
         
        
          
             
              
                CH243484A 
                (en )
               
            
            
           
          
            1946-07-15 
            
            
           
          
  Circuit arrangement in telephone systems with several exchanges in series.
 
      
         
        
          
             
              
                CH226576A 
                (en )
               
            
            
           
          
            1943-04-15 
            
            
           
          
  Circuit arrangement for counting connections of different values in telecommunications, in particular telephone systems.
 
      
         
        
          
             
              
                CH244782A 
                (en )
               
            
            
           
          
            1946-09-30 
            
            
           
          
  Circuit arrangement for telephone systems with main and sub-offices.
 
      
         
        
          
             
              
                CH226358A 
                (en )
               
            
            
           
          
            1943-03-31 
            
            
           
          
  Circuit arrangement for telephone systems with main and sub-offices.
 
      
         
        
          
             
              
                CH234468A 
                (en )
               
            
            
           
          
            1944-09-30 
            
            
           
          
  Circuit arrangement in telephone systems with dialer operation.
 
      
         
        
          
             
              
                CH244726A 
                (en )
               
            
            
           
          
            1946-09-30 
            
            
           
          
  Circuit arrangement in telephone subscriber sets.
 
      
         
        
          
             
              
                CH236137A 
                (en )
               
            
            
           
          
            1945-01-15 
            
            
           
          
  Circuit arrangement in telephone networks with several exchanges in series.