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      Bohuslav Brauner
          
          * 1855 in Prague
              + 1935 in Prague
          
          
           
        
      
      
        Bohuslav Brauner was a Czech chemist from the University of
      Prague,
      who investigated the properties of the rare earth elements,
      especially the determination of their atomic weights.
      Brauner predicted the existence of the rare earth element
      promethium ten years before its discovery.
      
      
        2021 J. Giesen