McVitie Weston valve collection, valve
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LicenseValve, spherical bulb 10in diam, with neck 1.75in diam x 5
Science Museum Group
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Valve, spherical bulb 10in diam, with neck 1.75in diam x 5.5in long, carrying central loop anode, side pip carrying cathode connector, plus opposite evacuating pip, (RMW/P1 - McVitie Weston number), by Unknown maker.
