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Amazon.com: 3M Littmann Stethoscope, Classic II Infant, Black Tube, Stainless Steel Chestpiece, 28 inch, 2114 : Industrial & Scientific
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3M Littmann Classic II S.E. Teaching Stethoscope 2138 Black-Burgundy - USA Medical and Surgical Supplies
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Amazon.com: 3M Littmann Classic II Estetoscopio para niños (múltiples tamaños/colores), 1 : Industrial y Científico
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