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Amazon.com: 3M 6163 Littmann Cardiology IV Black Chestpiece Stethoscope with 27" Black Tube : Industrial & Scientific
![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 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](https://pbs.twimg.com/media/B-I3kK9IgAAfLXJ.jpg)
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
![Amazon.com: 3M 6163 Littmann Cardiology IV Black Chestpiece Stethoscope with 27" Black Tube : Industrial & Scientific Amazon.com: 3M 6163 Littmann Cardiology IV Black Chestpiece Stethoscope with 27" Black Tube : Industrial & Scientific](https://m.media-amazon.com/images/I/61L-PM2GONL._AC_UF1000,1000_QL80_.jpg)