Assertion: radio wave's use | /r/HasProperty | demonstrated by numerous groups
Facets:
value: in australia
type: LOCATION
value: in the uk
type: LOCATION
value: during world war ii
type: TEMPORAL
value: in iran
type: LOCATION
Source sentences:
text: The use of a sea-cliff interferometer had been demonstrated by numerous groups in Australia, Iran and the UK during World War II, who had observed interference fringes (the direct radar return radiation and the reflected signal from the sea) from incoming aircraft.