Willem Einthoven (1860-1927).
Haas
L F
LF
D002309:Cardiology / Q000266:history; D004562:Electrocardiography / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008800:Mexico; D009426:Netherlands; D010678:Philately; D010827:Physiology / Q000266:history