Assertion: piano's key | /r/HasProperty | seven octaves
Facets:
Source sentences:
text: Many older pianos only have 85 keys (seven octaves from A 0 to A 7 ).
text: Many older pianos only have 85 keys (seven octaves from A0 to A7), while some manufacturers extend the range further in one or both directions.
text: Many older pianos only have 85 keys (seven octaves from A 0 to A 7 ).