Early binaural stethoscope
1861-1866
1861-1866
circa 1861
circa 1860
1862
1850-1859
1845
1849
1855
1865
1860
1846-1859
1842
1850
1842
1851
1845-1855
1847
1853
1857
1842
1845
1845
1858
1858-03-02
1865-1866
1854
1858
1846
1848
1858
1860
1851
1857-1858
1865
1857-1858
1857-1858
1866
1865
1853
1852
1843
1955; 1830
1849
1845-1851
1862
1862
1854
1850
1867
1867