GB487708A 
                (en )
               
            
            
           
          
            1938-06-24 
            
            
           
          Improvements in or relating to aerial and feeder systems 
      
         
        
          
            
                GB464443A 
                (en )
               
            
            
           
          
            1937-04-19 
            
            
           
          Improvements in or relating to aerial systems 
      
         
        
          
            
                BE447791A 
                (forum.php )
               
            
            
           
          
             
           
        
          
            
                US2187014A 
                (en )
               
            
            
           
          
            1940-01-16 
            
            
           
          Antenna transformer 
      
         
        
          
            
                GB528179A 
                (en )
               
            
            
           
          
            1940-10-24 
            
            
           
          Improvements in or relating to thermionic valve amplifiers 
      
         
        
          
            
                GB436012A 
                (en )
               
            
            
           
          
            1935-10-03 
            
            
           
          Improvements in or relating to high frequency transmission systems 
      
         
        
          
            
                US1895071A 
                (en )
               
            
            
           
          
            1933-01-24 
            
            
           
          Dynamic loud speaker unit 
      
         
        
          
            
                GB581972A 
                (en )
               
            
            
           
          
            1946-10-31 
            
            
           
          Improvements in or relating to concentric line impedance transformers 
      
         
        
          
            
                GB462911A 
                (en )
               
            
            
           
          
            1937-03-17 
            
            
           
          Improvements in and relating to feeders and the like for electric currents of high frequency 
      
         
        
          
            
                GB344444A 
                (en )
               
            
            
           
          
            1931-02-27 
            
            
           
          An improved distributor for use in telegraphy or the like 
      
         
        
          
            
                FR27255E 
                (fr )
               
            
            
           
          
            1924-05-31 
            
            
           
          Perfectionnements aux systèmes de transmission électrique de signaux et analogues au moyen de courants de fréquence élevée le long des lignes de transport d'énergie 
        
         
        
          
            
                US3437947A 
                (en )
               
            
            
           
          
            1969-04-08 
            
            
           
          Signal amplifier having grounded-base stage for a cable terminating impedance 
        
         
        
          
            
                US3458846A 
                (en )
               
            
            
           
          
            1969-07-29 
            
            
           
          Reactance-free reversely folded resistive shunt in coaxial line 
        
         
        
          
            
                US1639727A 
                (en )
               
            
            
           
          
            1927-08-23 
            
            
           
          Aerial 
      
         
        
          
            
                SU76555A3 
                (ru )
               
            
            
           
          
            1948-11-30 
            
            
           
          Устройство дл соединени концентрического фидера с двум возбуждаемыми в противоположных фазах симметричными концентрическими лини ми 
        
         
        
          
            
                US2754482A 
                (en )
               
            
            
           
          
            1956-07-10 
            
            
           
          Band-pass circuit arrangements 
        
         
        
          
            
                GB630010A 
                (en )
               
            
            
           
          
            1949-10-04 
            
            
           
          Centre fed antenna 
      
         
        
          
            
                US1770821A 
                (en )
               
            
            
           
          
            1930-07-15 
            
            
           
          Telephonic apparatus for deep-sea diving 
      
         
        
          
            
                USD59840S 
                (en )
               
            
            
           
          
            1921-11-29 
            
            
           
          Design for an attachment-plug or connector  
         
        
          
            
                BE449657A 
                (forum.php )
               
            
            
           
          
            1943-04-30 
            
            
           
           
        
          
            
                CH99628A 
                (fr )
               
            
            
           
          
            1923-06-16 
            
            
           
          Installation téléphonique comprenant un dispositif amplificateur des courants devant être transmis sur une ligne interurbaine. 
        
         
        
          
            
                GB274576A 
                (en )
               
            
            
           
          
            1927-07-25 
            
            
           
          Improvements in and relating to sound amplifying devices for use with telephone receivers 
      
         
        
          
            
                GB469245A 
                (en )
               
            
            
           
          
            1937-07-21 
            
            
           
          Improvements in or relating to wireless aerial systems 
      
         
        
          
            
                USD115449S 
                (en )
               
            
            
           
          
            1939-06-27 
            
            
           
          Design for a signal device  
         
        
          
            
                GB653876A 
                (en )
               
            
            
           
          
            1951-05-30 
            
            
           
          Improvements in and relating to short-wave aerials