McVitie Weston valve collection, Siemens-Schottky valve, type GV15
- Made:
- circa 1918
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Siemens-Schottky valve, type GV15, blue spot on outer grid support, white spot on inner, glass envelope broken, electrodes corroded, (RMW/G52 - McVitie Weston number), by Siemens-Schottky Company Limited, c. 1918.
