Assertion: tennis ball's property | /r/HasProperty | increased by stitching flannel
Facets:
value: on to the core
type: TRANSITIVE-OBJECT
Source sentences:
text: From the beginning of tennis in the 1870’s, India rubber, made from a vulcanization process invented by Charles Goodyear in the 1850s, was used to manufacture lawn tennis balls.(Incorporation, 2011)The first rubber tennis balls were made out of pure rubber, and their properties were increased by stitching flannel on to the core.