McVitie Weston valve collection, BTH valve, type B22
- Made:
- 1927
BTH valve, type B22, marked O.H.3, (RMW/C78 - McVitie Weston number), by British Thomson-Houston Company Limited, 1927.
BTH valve, type B22, marked O.H.3, (RMW/C78 - McVitie Weston number), by British Thomson-Houston Company Limited, 1927.