Twenty years later, he completed a device that was smaller than the first two, and weighed less.

VOA: special.2010.07.14

In nineteen forty-seven, Doctor Beck saved a patient with a defibrillator device for the first time.

VOA: special.2009.08.11

She remembers that the man operating the device at first refused to accept her material.

VOA: special.2010.02.09