McVitie Weston valve collection, Marconi WT Co Round valve, type T
- Made:
- 1917
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Marconi WT Co Round valve, type T, marked PF-HC-3F, grid pip broken, bayonet cap for filament with 4 additional wander leads, (RMW/J2 - McVitie Weston number), by Marconi Wireless Telegraph Company Limited, 1917.
