Assertion: blitz | /r/HasProperty | done linebacker
Facets:
value: sometime between 1948–1950
type: TEMPORAL
value: for the university of kansas
type: LOCATION
value: by red ettinger
type: OTHER
Source sentences:
text: The blitz began with the "red-dog", likely first done by Red Ettinger a linebacker for the University of Kansas, sometime between 1948–1950.