Assertion: overhead projector | /r/ObjectUse | used in late 1950s
Facets:
value: widely
type: DEGREE
value: to be used in schools
type: PURPOSE
Source sentences:
text: Overhead projectors began to be widely used in schools and businesses in the late 1950s and early 1960s.
text: In the late 1950s and early 1960s, overhead projectors began to be widely used in schools and businesses.
text: Overhead projectors began to be widely used in schools and businesses in the late 1950s and early 1960s.