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Amazon.com: Compatible Replacement Tube by CardioTubes fits Littmann(r) MasterCardiologyI(r) and Littmann(r) Cardiology III(r) Stethoscopes - 7mm Binaurals BLACK TUBING : Industrial & Scientific
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Amazon.com: 3M Littmann Cardiology III Stethoscope, Black Tube, 27 inch, 3128 : Industrial & Scientific
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