McVitie Weston valve collection, BTH valve, type B7
- Made:
- 1926
BTH valve, type B7, marked K3, (RMW/C74 - McVitie Weston number), by British Thomson-Houston Company Limited, 1926.
BTH valve, type B7, marked K3, (RMW/C74 - McVitie Weston number), by British Thomson-Houston Company Limited, 1926.