Assertion: piano's octave | /r/HasProperty | four notes
Facets:
Source sentences:
text: This 1870 Streicher has leather (not felt) hammers, a rather light metal frame (with just two tension bars), a range of just seven octaves (four notes short of the modern range), straight- (rather than cross-) stringing, and a rather light Viennese action, a more robust version of the kind created a century earlier by Stein.