McVitie Weston valve collection, Marconi WT Co valve, type E.44A.
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Marconi WT Co valve, type E.44A
Science Museum Group
© The Board of Trustees of the Science Musuem
Marconi WT Co valve, type E.44A., pinch marked 4549, standard 4-pin base with anode pin clipped off and replaced by top cap, external pip, filament broken, (RMW/J45 - McVitie Weston number), by Marconi Wireless Telegraph Company Limited.
