[ECG DOCUMENTATION ON MACHINE PUNCHED CARDS].
D003937:Diagnosis, Differential; D004282:Documentation; D004562:Electrocardiography; D006331:Heart Diseases; D006801:Humans; D011642:Publications; D011676:Punched-Card Systems
DIAGNOSIS, DIFFERENTIAL; ELECTROCARDIOGRAPHY; HEART DISEASES; PUNCHED-CARD SYSTEMS
EKG-DOKUMENTATION AUF MASCHINENLOCHKARTEN.