Assertion: overhead projector | /r/HasProperty | introduced into u.s. military training
Facets:
value: during world war ii
type: TEMPORAL
Source sentences:
text: Overhead projectors were introduced into U.S. military training during World War II.
text: During World War II, overhead projectors were introduced into U.S. military training.
text: Overhead projectors were introduced into U.S. military training during World War II, and used at schools like the U.S. Military Academy after the war.