Early binaural stethoscope
1861-1866
1861-1866
1864-1900
circa 1861
1862
after 1903
1895
1870
circa 1900
1878
circa 1900
1903
1902
circa 1880
1900
1875
1884
1901
circa 1885
1895
1896
1902
1898
1901
1886
1896
1865-1866
1904
1875
1901
1870-1890
1885
1870-1880
1898
1865
1866
1865
1871-1900
1871
1874-1900
circa 1890
circa 1890
circa 1890
circa 1890
1872-1880
1898-1899
1903
1892
1934
1876
1878