Assertion: luffing crane | /r/CapableOf | move the hook
Facets:
value: relative to the base
type: OTHER
value: inwards
type: MANNER
Source sentences:
text: A level-luffing crane is a crane mechanism where the hook remains at the same level whilst luffing; moving the jib up and down, so as to move the hook inwards and outwards relative to the base.