Assertion: pulley | /r/HasProperty | essential
Facets:
value: to numerous machines
type: TRANSITIVE-OBJECT
value: to being able
type: PURPOSE
Source sentences:
text: Pulleys are also essential for most machines in some form or other.
text: Pulleys are essential to being able to move and lift very heavy or large items.
text: Pulleys are essential to numerous machines, ranging from cranes to airplanes.