Ear-plate from monaural stethoscope
1831-1910
Wormull's monaural stethoscope
King's monaural stethoscope
Monaural stethoscope
Monaural stethoscope
Portable monaural stethoscope, by Maw, English
King's monaural stethosope
Quain's monaural stethoscope
1841-1898
King's monaural stethoscope
Portable monaural stethoscope
1890
Portable monaural stethoscope
King's monaural stethoscope
1890
Hare's monaural stethoscope, English(?), 1851-1910
1851-1910