Assertion: sided stethoscope | /r/CapableOf | come into play
Facets:
value: really
type: DEGREE
value: in the 1940s
type: TEMPORAL
Source sentences:
text: The two-sided stethoscope really came into play in the 1940s until David Littman (of Littman Cardiology fame) developed a new model in the 1960s that formed the basis of modern stethoscope design.