Google doodle today pays tribute to René Laennec. René-Théophile-Hyacinthe Laennec was a French physician. He invented the stethoscope in 1816, while working at the Hôpital Necker and pioneered its use in diagnosing various chest conditions. Link

Read more about the life and work of René Laennec. Link

The first drawing of a stethoscope, 1819

 One of the original stethoscopes belonging to Rene Theophile Laennec made of wood and brass