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![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 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](https://l450v.alamy.com/450v/2ddhgrw/medical-instrument-stethoscope-1750-1850-the-single-ear-wooden-stethoscope-was-developed-from-rene-laennecs-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superseded-by-two-ear-stethoscopes-from-around-1886-wood-science-and-industry-social-history-health-and-medicine-health-surgery-treen-2ddhgrw.jpg)