Allison's differential binaural stethoscope by Weiss and Son
1859-1865
1859-1865
1851-1940
1851-1950
1861-1930
1861-1930
1871-1940
1861-1930
1851-1940
1859-1865
1871-1950
1851-1920
1891-1950
1861-1940
1861-1940