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Theophile Laennec (1781-1826), young French physician, while at Necker Hospital, Paris, in 1816, devised foot-long hollow wooden cylinders for listening to sounds in patients' chests. These he called "Stethoscopes". With them, Laennec learned to accurately diagnose many pathologic heart and lung conditions, and to understand many common pulmunary diseases - especially tuberculosis.
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