Chest piece from binaural stethoscope
1861-1930
Binaural stethoscope
Binaural stethescope, by Hawksley, English, c1920
1910-1930
Wincarnis's binaural stethoscope
Binaural stethoscope
Binaural stethoscope
Binaural stethoscope
1861-1920