Imperial Bösendorfer
Imperial Bösendorfer is a grand piano.
Overview
97 key grand piano.
In detail
Imperial Bösendorfer is a grand piano.
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
“Imperial Bösendorfer”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q3657114: Imperial Bösendorfer
Consult the source