Stethoscope, binaural, metal
1801-1900
Binaural stethoscope
1910
Bowle's binaural stethoscope chest-piece
Chest piece from binaural stethoscope
1870-1920
Frossard's binaural stethoscope (cased)
Ebony chest piece
Chest-piece from binaural stethoscope
1871-1930