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The modern binaural stethoscope with two ear pieces was invented in 1851 by Arthur Leared.
Cammann also wrote a major treatise on diagnosis by auscultation, which the refined binaural stethoscope made possible.
In 1851, Irish physician Arthur Leared invented a binaural stethoscope, and in 1852 George Cammann perfected the design of the instrument for commercial production, which has become the standard ever since.
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