171A

Common type USA tube/semicond. Air Scout - tubes Arrow Tube Company; Springfield, MA Commander Radio Tubes; (where?) Diatron (tubes), Diamond Vacuum Products Co; Chicago, IL Everbest Radio Corp.; New York, NY Everite Tube Co.; Providence, RI Harmonique (Tube Brand), A. E. Simon; Chicago, IL Kelly Tube Co.; New York, NY Lafayette Radio & TV Corp; New York (NY) Legion (Tube brand); (Where ?) McCullough, Frederick, S. Co.; Wilkinsburg, later Sales Company; Pittsburg Paramount Radio Tube Co.; Brooklyn, NY Real Tone Tube Co.; Pawtucket, RI Rextron Radio Corporation (tube brand); Chicago Sonatron Tube Company; Chicago and New York