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   Rene Laennec's Stethoscope Changed Medical Examinations Forever. ...

   Quinine Helped Turn the Tide on Malaria. ...

   Aspirin is Still the World's Most Used Medicine. ...

   World's First Blood Transfusion Has Since Saved Countless Lives.

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In the 1800 instruments such as the microscope and the thermometer were created and led to the invention of new instruments such as the ophthalmoscope for looking inside the eye, and the sphygmograph for measuring blood pressure.

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