"Bösendorfer (L. Bösendorfer Klavierfabrik GmbH) is an Austrian piano manufacturer and, since 2008, a wholly owned subsidiary of Yamaha Corporation. Bösendorfer is unusual in that it ...
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produces 97- and 92-key models in addition to instruments with standard 88-key keyboards." - (en.wikipedia.org 11.08.2021)