McVitie Weston valve collection, BTH valve, type B.4
- Made:
- 1923
BTH valve, type B.4, (RMW/C69A - McVitie Weston number), by British Thomson-Houston Company Limited, 1923.
BTH valve, type B.4, (RMW/C69A - McVitie Weston number), by British Thomson-Houston Company Limited, 1923.