McVitie Weston valve collection, BTH Vacuo-Junction valve
- Made:
- 1933
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BTH Vacuo-Junction valve, cylindrical glass envelope 1.7in diam with top pip on std. Brit 4-pin base, marked A.J.M.-R.M.W.II 1933, (RMW/P58 - McVitie Weston number), by British Thomson-Houston Company Limited, 1933.
