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Andrew P. D'Zmura, M.D.
JAMA. 1931;96(6):439-440. doi:10.1001/jama.1931.27220320001008.
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In 1926, the late Mr. Joseph W. Legg, research engineer of a large industrial company,1 conceived the idea of applying the oscillograph, an instrument of precision used for many purposes in electrical engineering, to clinical medicine.

Through the courtesy of Dr. T. Lyle Hazlett, medical director of the company, the opportunity was given to me to consult with Mr. Legg, and it was decided that the first application of his device would be to electrocardiography.

The untimely death of Mr. Legg made it necessary for his associates Mr. Clare Anderson, Mr. H. T. Rights and Mr. R. H. Lewis to solve the technical details involved in adapting the oscillograph to a different range of sensitivity, conforming to the accepted standards used in electrocardiography.

The outcome of this work has been a new electrocardiograph. It is a self-contained apparatus, weighing considerably less than any other cardiograph now available. This complete


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