1 ene 1952 año - New
event
Descripción:
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.
Añadido al timeline:
fecha:
1 ene 1952 año
Ahora mismo
~ 72 years ago