Assertion: concertina's button | /r/CapableOf | produce same unisonoric
Facets:
Source sentences:
text: The word concertina refers to a family of hand-held bellows-driven free reed instruments constructed according to various systems, which differ in terms of keyboard layout, and whether individual buttons (keys) produce the same (unisonoric) or different (bisonoric) notes with changes in the direction of air pressure.