1 янв 1952 г. - New event

Описание:

Swedish cardiologist Inge Edler and German physicist Carl Hellmuth Hertz launch the field of echocardiography, by adapting for human use a sonar device (that was used for detecting submarines in World War II) and using it to record echoes from the walls of a human heart. American cardiologist Paul Zoll develops the first external cardiac pacemaker.

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