McVitie Weston valve collection, BTH valve, type R4
- Made:
- 1923
BTH valve, type R4, marked F.L. BBC, (RMW/B114 - McVitie Weston number), by British Thomson-Houston Company Limited, 1923.
BTH valve, type R4, marked F.L. BBC, (RMW/B114 - McVitie Weston number), by British Thomson-Houston Company Limited, 1923.