McVitie Weston valve collection, Ediswan E.S.W.501
- maker:
- Royal Ediswan
Ediswan valve, type E.S.W.501, spherical bulb with vertical graphite anode, (RMW/J128A - McVitie Weston number), by Royal Ediswan
Ediswan valve, type E.S.W.501, spherical bulb with vertical graphite anode, (RMW/J128A - McVitie Weston number), by Royal Ediswan