Assertion: filter | /r/HasProperty | needed
Facets:
value: no longer
type: TEMPORAL
Source sentences:
text: Also, the wider the shape of the filters, the fewer filters that are needed to span the input bandwidth.
text: To the novice photographer taking their first landscape photo, it might not be immediately clear why filters for landscape photography are necessary.
text: It recommended removing retrievable devices within 1-2 months after implantation, once the filter is no longer needed.