Littmann® Classic III™ Monitoring Stethoscope, #5912C Stainless-finish Chestpiece, Marine Blue Tube, 27 inch
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3M Littmann Stethoscopes on X: "To register your 3M™ Littmann® Stethoscope, you'll need your serial number, which is found on your chestpiece. http://t.co/ElEnz3HmSl" / X
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Warranty Registration
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Amazon.com: 3M Littmann Classic III Monitoring Stethoscope, Navy Blue Tube, 27 Inch, 5622 & 40007 Stethoscope Identification Tag, Black : Industrial & Scientific
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