Assertion: accordion | /r/HasProperty | unisonoric
Facets:
Source sentences:
text: Piano accordions are unisonoric.
text: Accordions may be either bisonoric, producing different pitches depending on the direction of bellows movement, or unisonoric, producing the same pitch in both directions.
text: (In contrast, most other types of accordion, for example piano accordions and chromatic button accordions, are "double-action" – or unisonoric – because each key produces a single note regardless of bellows direction.)