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  Indian J Med Microbiol
 

Figure 2: (a) Norman Jeff Holter. (b) Willem Einthoven. (c) Wellysis S-Patch (Device 8 grams + Battery 3 grams = 11 grams). (d) Man wearing the first mobile ambulatory electrocardiograph (55 pounds) in 1947

Figure 2: (a) Norman Jeff Holter. (b) Willem Einthoven. (c) Wellysis S-Patch (Device 8 grams + Battery 3 grams = 11 grams). (d) Man wearing the  first mobile ambulatory electrocardiograph (55 pounds) in 1947