This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables.
To the Editor:—
I was interested to read Dr. Leon Horowitz's reference to Stereophonic Binaural Differential Stethoscope. In the last paragraph he states that neither he nor his colleagues, many of whom were thoracic specialists, had ever heard of such an instrument.The late William J. Kerr, MD, Professor Emeritus of Medicine, University of California Medical School, in the late 30's instructed us with an instrument that he had developed....
Collins L. The Kerr Symballophone. JAMA. 1965;193(5):403. doi:10.1001/jama.1965.03090050079035