Assertion: polonium's use | /r/HasProperty | demonstrated under president eisenhower
Facets:
value: in 1961
type: TEMPORAL
Source sentences:
text: The use of satellites powered by SNAP for global communication was first demonstrated under President Eisenhower in 1961, at which time the President's peace message was broadcast via a satellite containing a radio transmitter powered by the SNAP-3A RTG.
text: The use of satellites powered by SNAP for global communication was first demonstrated under President Eisenhower in 1961, at which time the President’s peace message was broadcast via a satellite containing a radio transmitter powered by the SNAP-3A RTG.