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Fleming Oscillation Valve

Fleming oscillation valve, (RMW/A17 - McVitie Weston number), by Royal Ediswan, 1906, invented by Sir (John) Ambrose Feming.
Fleming oscillation valve, (RMW/A17 - McVitie Weston number), by Royal Ediswan, 1906, invented by Sir (John) Ambrose Feming.