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**EDS.: RETRANSMISSION OF XNYT65 SENT AUG. 9, 2017, TO CORRECT ORDER OF SUBJECTS** The founders of Eko Devices, from left, Tyler Crouch, Jason Bellet and Connor Landgraf, in Berkeley, Calif., June 27, 2017. The company has built the Duo, a digital stethoscope for home use, which could change how heart patients are monitored, the entrepreneurs said. (Christie Hemm Klok/The New York Times/Fotoarena)
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