McVitie Weston valve collection, GEC/USA Kenotron valve, type TB1
GEC/USA Kenotron valve, type TB1, (RMW/A148 - McVitie Weston number), by General Electric Company Limited.
GEC/USA Kenotron valve, type TB1, (RMW/A148 - McVitie Weston number), by General Electric Company Limited.