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