Assertion: crude oil | /r/CapableOf | become important
Facets:
value: in the course of time
type: TEMPORAL
value: as petroleum
type: OTHER
Source sentences:
text: In a 1912 speech Diesel said, "the use of vegetable oils for engine fuels may seem insignificant today but such oils may become, in the course of time, as important as petroleum and the coal-tar products of the present time.