concertina
concertina is a squeezebox or free reed aerophone.
Overview
Free-reed musical instrument.
In detail
concertina is a squeezebox or free reed aerophone.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Concertina”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q593050: concertina
Consult the source