Stethoscopes face challenge after 200 years

Conventional stethoscopes are facing a formidable challenge from upstart new technology based on a smartphone and a portable device about the size of a 50 cent coin.

The stethoscope was invented in 1816 by French physician René Laënnec, and has essentially been unchanged since.

But on the eve of its 200th anniversary, the emergence of the new technology could mark the

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