McVitie Weston valve collection, Mullard ORA valve
- maker:
- Mullard Limited
Mullard ORA valve, marked S273, filament broken, (RMW/B115B - McVitie Weston number), by Mullard Limited.
Mullard ORA valve, marked S273, filament broken, (RMW/B115B - McVitie Weston number), by Mullard Limited.