McVitie Weston valve collection, BTH valve, type B2
- Made:
- 1926
BTH valve, type B2, etched J.J.3, filament missing, (RMW/B74B - McVitie Weston number), by British Thomson-Houston Company Limited, 1926.
BTH valve, type B2, etched J.J.3, filament missing, (RMW/B74B - McVitie Weston number), by British Thomson-Houston Company Limited, 1926.