McVitie Weston valve collection, Marconi valve, type M.T.3.F.
- maker:
- Marconi Company Limited
Marconi valve, type M.T.3.F., marked 3985V, stems marked 3 and 4983, (RMW/J70 - McVitie Weston number), by Marconi Company Limited.
Marconi valve, type M.T.3.F., marked 3985V, stems marked 3 and 4983, (RMW/J70 - McVitie Weston number), by Marconi Company Limited.