Early binaural stethoscope
1861-1866
1861-1866
circa 1861
circa 1860
1862
1865
circa 1868
1860
1857
1858
1858-03-02
1865-1866
1858
1858
1869
1860
1857-1858
1865
1857-1858
1857-1858
1866
1865
1867-1868
1955; 1830
1862
1862
2000-100 BCE
1856
1893-4
1867
1863-7
1864
1863-1865
1860
1934
1858
circa 1861
1867
1867
1859
1990-96
1860
1867
1860
1865
1930 (replica); 1834 (original)
1857
1858
circa 1860
1869
before 1857