Assertion: pocketknife's blade | /r/HasProperty | hinged at end
Facets:
Source sentences:
text: A "pen knife" is a small, light-weight, double-ended knife with two or three blades that are hinged at both ends.
text: The standard jack knife has a blade or blades hinged only on one end; a double-end jack knife is heavier and there is at least one blade that opens on each end.