Assertion: cornet's valve | /r/HasProperty | oiled
Facets:
value: depending on the usage
type: OTHER
Source sentences:
text: It also requires that the valves be oiled 2 to 3 times a week, or even daily, depending on the usage.
text: The valves need to be soaked in warm and soapy water every two weeks and have to be oiled as well.