MacGregor-Morris, John Turner, 1872- The inventor of the valve; a biography of Sir Ambrose Fleming. With a foreword by E.W. Marchant.

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MacGregor-Morris, John Turner, 1872-

The inventor of the valve; a biography of Sir Ambrose Fleming. With a foreword by E.W. Marchant.

Fleming, J. A. (John Ambrose), Sir, 1849-1945.