McVitie Weston valve collection, Marconi Osram rectifier valve, type QX
- Made:
- 1916
- maker:
- M-O Valve Company Limited
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Marconi Osram rectifier valve, type QX, etched F 2285, (RMW/B99 - McVitie Weston number), by M-O Valve Co. Limited, 1916.
