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Common type USA tube/semicond. Actron Corp.; Chicago Argus Radio Tube Co. - see also CeCo and Continental; Providence, RI Everbest Radio Corp.; New York, NY Hudson; (where ?) Hylon (tubes), brand Kelly Tube Co.; New York, NY Knight (tubes), brand Lafayette Radio & TV Corp; New York (NY) Legion (Tube brand); (Where ?) McCullough, Frederick, S. Co.; Wilkinsburg, later Sales Company; Pittsburg Navigator (tubes) - see also A-C Dayton; Dayton, OH Paramount Radio Tube Co.; Brooklyn, NY Powertone (brand): Barfield Electrical Laboratories, New York NY Real Tone Tube Co.; Pawtucket, RI Royal Tube Co.; Pawtucket, RI Silvertone (tubes) - see also Sears; Chicago, IL Speed, Cable Radio Tube Corp. / Cable Supply Co.; New York and Brooklyn, NY Thorola, Winkler-Reichmann Co.; Chicago, IL Tip Top (tube brand)