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Amazon.com: 3M 40012 Littmann Stethoscope Spare Parts Kit, Classic II Pediatric Diaphragm Assembly, Black : Industrial & Scientific
Why is most of the chest piece in the stethoscope in a circular shape? Will it work if it is designed in some other shape? - Quora
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Amazon.com: Paramed Stethoscope - Classic Dual Head - for Doctors, Nurses, Med Students, Professional Pediatric, Medical, Cardiology, Home Use - Extra Diaphragm, 4 Eartips, Accessory Case, Name Tag - 29.5 inch : Industrial & Scientific
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Medical Stethoscope Spare Parts Replacement Rim Accessories Diaphragm with Rim Assembly Kit Black for Littmann Stethoscope - AliExpress
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