Assertion: concertina's bellow | /r/HasProperty | drawn
Facets:
Source sentences:
text: Most diatonic button accordions have a "single-action" (or bisonoric) keyboard,[citation needed] meaning that each button produces two notes: one when the bellows are pressed or pushed (closed) and another when the bellows are drawn or pulled (opened).
text: The remaining notes of the diatonic scale are produced when the bellows are drawn or pulled.
text: When the bellows are drawn apart, all the notes fall magically onto the lines.