Sanborn Visette portable electrocardiograph, model 300, made by Sanborn in the 1950s, used by the donor of the National Heart Hospital. Sanborn Visette portable electrocardiograph 1950-1959
Cardisuny Electrocardiograph, type 503D, from the Occupational Health Department of the London School of Hygiene and Tropical Medicine, by Fukuda M.E Kogyo Ltd, Tokyo, Japan, 1970-1990 with accessories Cardisuny Electrocardiograph