Siemens hopes that its miniaturized ultrasound device, which can fit in a physician's coat pocket, will become the stethoscope of the 21st century. Doctors could use it during routine exams, nurses could use it for triage in the emergency-room lobby, and emergency medical technicians could use it at the sites of accidents. Siemens says the key to miniaturization was a proprietary display technology that produces clear images even at small sizes.

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