Assertion: revolving door | /r/HasProperty | invented in philadelphia
Facets:
value: to reduce air infiltration
type: PURPOSE
value: by theophilus van kannel
type: OTHER
Source sentences:
text: Revolving doors were invented in Philadelphia in 1888 by Theophilus Van Kannel to reduce air infiltration.
text: Revolving doors were invented in Philadelphia in 1888 by American-born Theophilus Van Kannel to reduce air infiltration.