McVitie Weston valve collection, B.U.R.T.S. London Harries experimental valve, type E22A
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© The Board of Trustees of the Science Museum
B.U.R.T.S. London Harries experimental valve, type E22A
Science Museum Group
© The Board of Trustees of the Science Museum
B.U.R.T.S. London Harries experimental valve, type E22A, marked 24A, pinch marked 1.5, (RMW/G39 - McVitie Weston number), by Unknown maker.
