A gutta-percha monaural stethoscope - 6½in high; a metal and composition monaural stethoscope, 19th Century - 7½in. high; and another metal stethoscope with removable earpiece (replacement chest piece)

细节
A gutta-percha monaural stethoscope - 6½in high; a metal and composition monaural stethoscope, 19th Century - 7½in. high; and another metal stethoscope with removable earpiece (replacement chest piece)