McVitie Weston valve collection, Von Ardenne Experimental valve, type 20
- Made:
- circa 1929 in Germany
- maker:
- Manfred von Ardenne
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Von Ardenne Experimental valve, type 20, uncapped, (RMW/E22 - McVitie Weston number), by Ardenne, Manfred von, c. 1929.
