Assertion: engine's piston | /r/HasProperty | mounted on the crankshaft
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: The pistons are usually mounted on the crankshaft such that opposing pistons move back and forth in opposite directions at the same time, somewhat like a boxing competitor punching their gloves together before a fight, which has led to it being referred to as a boxer engine.