McVitie Weston valve collection, Osram valve, type NR27A
- maker:
- Osram
Osram valve, type NR27A, glass envelope marked ADM.PATT. W1039, (RMW/Y441B - McVitie Weston number), by Osram.
Osram valve, type NR27A, glass envelope marked ADM.PATT. W1039, (RMW/Y441B - McVitie Weston number), by Osram.