McVitie Weston valve collection, King valve
- Made:
- 1924
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King valve, spherical glass envelope 1.5in diameter with a side tube for anode terminal, cathode terminal, loose, and two evacuating pips, terminals corroded, carries label marked: KING. RUBIDIUM. 3.10.1924, (RMW/P34 - McVitie Weston number), by Workrite Manufacturing Company, 1924.
