McVitie Weston valve collection, MOV/GEC valve, type N.R.18
MOV/GEC valve, type N.R.18, serial no. 707.C, filament broken, (RMW/B93B - McVitie Weston number), by M-O Valve Co. Limited; General Electric Company Limited.
MOV/GEC valve, type N.R.18, serial no. 707.C, filament broken, (RMW/B93B - McVitie Weston number), by M-O Valve Co. Limited; General Electric Company Limited.