McVitie Weston valve collection, Marconi valve, type D.E.210
- maker:
- Marconi Company Limited
Marconi valve, type D.E.210, (RMW/C39 - McVitie Weston number), by Marconi Company Limited.
Marconi valve, type D.E.210, (RMW/C39 - McVitie Weston number), by Marconi Company Limited.