E. F. Johnson Company Product. Tube. Material: glass, metal. Size: 3" diameter bulb x 7 1/2" L. Description: clear glass bulb-shaped radio tube - etched on side: "Eimac 50T" - 4-pin metal base and 2 anode caps.
E.F. Johnson Co. Collection. With socket Acc. # 1.88.205. Waseca business: E.F. Johnson Co.; E.F. Johnson Company; E.F. Johnson Corporate Headquarters; E.F. Johnson Company Corporate Headquarters; E.F. Johnson Co. Corporate Headquarters; E. F. Johnson Co.; E. F. Johnson Company; E. F. Johnson Corporate Headquarters; E. F. Johnson Company Corporate Headquarters; E. F. Johnson Co. Corporate Headquarters.
