Assertion: overhead projector | /r/ObjectUse | used in business
Facets:
value: widely
type: DEGREE
Source sentences:
text: Overhead projectors were widely used in education and business before the advent of computer-based projection.
text: Overhead projectors began to be widely used in schools and businesses in the late 1950s and early 1960s.
text: Overhead projectors began to be widely used in schools and businesses in the late 1950s and early 1960s.