Hivac valve, type SG210, pinch marked EM130, top cap unattached, (RMW/G126 - McVitie Weston number), made by Hivac Limited, aka the High Vacuum Valve Company, London, 1933.
Hivac valve, type SG210, pinch marked EM130, top cap unattached, (RMW/G126 - McVitie Weston number), made by Hivac Limited, aka the High Vacuum Valve Company, London, 1933.