Assertion: external defibrillator | /r/CapableOf | deliver a lown type waveform
Facets:
value: until the mid 90s
type: TEMPORAL
Source sentences:
text: Until the mid 90s, external defibrillators delivered a Lown type waveform (see Bernard Lown) which was a heavily damped sinusoidal impulse having a mainly uniphasic characteristic.