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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Littmann Stethoscope: How To Recognize The Original One
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Stethoscope Serial Number | American Diagnostic Corporation
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3M™ Littmann® Classic III™ Stethoscope | 3M United States