Assertion: square piano | /r/HasProperty | built in larger sizes
Facets:
value: with more keys
type: OTHER
value: with a wider range
type: OTHER
value: over time
type: TEMPORAL
Source sentences:
text: Over time, square pianos were built in larger sizes with more keys and a wider range; by the 1830s, square grand pianos predominated, with changes to their internal mechanisms and construction that produced larger sounds and used higher string tensions.