Medical instrument, Stethoscope, 1750-1850 The single-ear wooden stethoscope was developed from Rene Laennec's paper roll of 1819. These were vase- or trumpet-shaped, turned in one piece from cedar, boxwood, ebony, or lignum vitae. They were superseded by two-ear stethoscopes from around 1886. Wood, Science and Industry, Social history, Health and Medicine, Health, Surgery, Treen

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