Audiometer, for measuring hearing ability, by Amplivox, London, England, c.1965 Audiometer, by Amplivox, London, England, c. 1965 1965
Politzer's acoumeter, steel with bone frame, by, Heinrich Reinder Vienna, 1875-1910 Politzer's acoumeter 1875-1910
Audiometer for testing hearing, in wooden case, by Amplivox Ltd., London, 1951-1960. Audiometer for testing hearing 1951-1960
Qualitone audiometer with instruction manual, made by the Qualitone Company, Minneapolis, U.S.A., 1960-1965. Qualitone audiometer with instruction manual 1960-1965