Bragg-Paul Pulsator
The Bragg-Paul Pulsator, also known as the Bragg-Paul respirator, was a non-invasive medical ventilator invented by William Henry Bragg and designed by Robert W. Paul in 1933 for patients unable to breathe for themselves due to illness. It was the first 'Intermittent Abdominal Pressure Ventilator' (IAPV).