McVitie Weston valve collection, BTH valve, type A.T.40
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BTH valve, type A.T.40, marked 8366, pinch marked M
Science Museum Group
© The Board of Trustees of the Science Museum
BTH valve, type A.T.40, marked 8366, pinch marked M, (RMW/J93B - McVitie Weston number), by British Thomson-Houston Company Limited.
