
McVitie Weston valve collection, Marconi WT Co Round valve, type DEQ

Marconi WT Co. valve, type DEQ, etched 295, (RMW/C18A - McVitie Weston number), by Marconi Wireless Telegraph Company Limited.
Marconi WT Co. valve, type DEQ, etched 295, (RMW/C18A - McVitie Weston number), by Marconi Wireless Telegraph Company Limited.