This electronic diode was one of Sir John Ambrose Fleming´s (1849-1945) own valves or vacuum tubes of the type used with the pioneering Marconi-Flemin...

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Image Number:  1895-14770Rights ManagedCredit Line:Science Museum/SSPL/Science and Society/SuperStockCollection:Science and SocietyContributor:Science Museum/SSPLModel Release:NoProperty Release:NoResolution:2770×3504
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