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Who invented the stethoscope?

In 1816, the French physician Rene Theoplhie Hyacinthe Laennec (1781-1826) introduced a performated wooden cylinder which concentrated the sounds of air flowing in and out of the lungs, and described the sound which it revealed. The modern form of stethoscope, with flexible tubes connection the earpieces to a circular piece placed against the chest, was developed later in the nineteenth century.