US3459996A 
                (en )
               
            
            
           
          
            1969-08-05 
            
            
           
          Starting circuit for direct current arc welder 
        
         
        
          
            
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                JPS649114B2 
                (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html )
               
            
            
           
          
            1989-02-16 
            
            
           
           
        
          
            
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                CH284599A 
                (fr )
               
            
            
           
          
            1952-07-31 
            
            
           
          Procédé de conversion d'un courant alternatif monophasé en impulsions de courant. 
        
         
        
          
            
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