McVitie Weston valve collection, Dario Tetrode valve, type S.G.
- Made:
- 1931
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Dario Tetrode valve, type S.G., base marked 1931 in pencil, top cap nut missing, (RMW/G152 - McVitie Weston number), by Societe Francaise Radioelectrique, 1931.
