The use of ultrasonic reflectoscope for the continuous recording of the movements of heart walls. 1954.
Edler
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I
Hertz
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CH
D004452:Echocardiography / Q000295:instrumentation; D006321:Heart / Q000502:physiology*; D006331:Heart Diseases / Q000000981:diagnostic imaging; D049673:History, 20th Century; D006801:Humans