McVitie Weston valve collection, North London Valve valve
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North London Valve valve, spherical bulb with top pip
Science Museum Group
© The Board of Trustees of the Science Museum
North London Valve valve, spherical bulb with top pip, copper and ebonite 4-pin base, Mg gettered, (RMW/A44A - McVitie Weston number), by North London Valve Company Limited.
