McVitie Weston valve collection, Mazda Tetrode valve
- Made:
- 1931
Mazda Tetrode valve, pinch marked HBZ6, stem marked 28, (RMW/Y269 - McVitie Weston number), by British Thomson-Houston Company Limited, 1931.
Mazda Tetrode valve, pinch marked HBZ6, stem marked 28, (RMW/Y269 - McVitie Weston number), by British Thomson-Houston Company Limited, 1931.