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The stethoscope was assembled with the technical assistance of V. Bühler; the circuit diagram was drawn by I. Odermatt.
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Biro, P. Electrically amplified precordial stethoscope. J Clin Monitor Comput 10, 410–412 (1994). https://doi.org/10.1007/BF01618424
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DOI: https://doi.org/10.1007/BF01618424