Assertion: piano | /r/HasAspect | knee levers
Facets:
Source sentences:
text: This piano had knee levers, and Mozart speaks highly of their functionality in a letter: "The machine which you move with the knee is also made better by [Stein] than by others.
text: This piano had two knee levers that were Janissary stops for bell and drum, and four pedals for una corda, bassoon, dampers, and moderator.