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3M Littmann Classic III Monitoring Stethoscope, Black Tube, 27 inch, 5620: Amazon.com: Industrial & Scientific
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Amazon.com: 3M Littmann Stethoscope, Master Cardiology, Black Tube, Stainless Steel Chestpiece, 27 inch, 2160 : Industrial & Scientific
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Amazon.com: 3M 6151 Littmann Cardiology IV Stainless Steel Chestpiece Stethoscope with 22" Black Tube : Industrial & Scientific
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