X112

Common type USA tube/semicond. Arrow Tube Company; Springfield, MA By Heck (tube brand) Champion Radio Works; Danvers, Massachusetts Concert Master Mfg. Co. (brand) - see also Continental Corp.; Chicago, IL and Newark NJ Diatron (tubes), Diamond Vacuum Products Co; Chicago, IL Gold Seal Electrical Co., Inc.; New York Sonatron Tube Company; Chicago and New York Thorola, Winkler-Reichmann Co.; Chicago, IL Ureco, United Radio and Electric Co.; Newark (NJ) and Brooklyn (NY)