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https://doi.org/10.1016/s0002-8703(37)91319-x
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Cite Journal: American Heart Journal |  Publication Date: Aug 1, 1937 |
 Citations: 2 |
Affiliation: Edward Hines, Jr. VA Hospital
A new apparatus for recording heart sounds is described, consisting essentially of an amplifier and magnetic radio speaker with a needle casting the shadow comprising the tracing attached directly to the moving coil. Advantages it is believed to possess over similar devices now in use are enumerated.
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