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Doctors might be familiar with the difference between a dual head stethoscope from a single head one. By searching for pictures in different search engines, people cannot see the total discrepancy of one from another. No worries because this article will have a general breakdown of the two equipments difference, and how each of them functions to help the doctor in his/her work.

http://www.youtube.com/watch?v=z0BtKXPcyT4