Assertion: rubber | /r/HasProperty | the valve
Facets:
Source sentences:
text: When he returned to the store to present his valve, the store manager said he should have invented a better use for rubber, not the valve.
text: Goodyear quickly invented an improved valve for the life preserver, but he was rebuffed by Roxbury and told that if he really wanted to improve the life preserver he would need to work on the rubber, not the valve.