Assertion: modern trampoline | /r/HasProperty | built by george nissen
Facets:
value: at the university of iowa
type: LOCATION
value: around 1934
type: TEMPORAL
value: in 1936
type: TEMPORAL
Source sentences:
text: The first modern trampoline was built by George Nissen and Larry Griswold in 1936.
text: The first modern trampoline was built by George Nissen and Larry Griswold around 1934 at the University of Iowa.
text: The first modern trampoline was built by George Nissen and Larry Griswold around 1934 at the University of Iowa.