McVitie Weston valve collection, Ediswan valve, type E.H.T. 220kV
- Made:
- circa 1920
Ediswan valve, type E.H.T. 220kV, filament broken, (RMW/A99 - McVitie Weston number), by Royal Ediswan, c. 1920.
Ediswan valve, type E.H.T. 220kV, filament broken, (RMW/A99 - McVitie Weston number), by Royal Ediswan, c. 1920.