"Johannes (Johann Christoph) Zumpe (pronounced zumpy; 14 June 1726 in Fürth, Free Imperial City of Nuremberg, modern Germany – buried 5 December 1790 in London, UK) ...
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was a leading maker of early English square pianos, a form of rectangular piano with a compass of about five octaves. The pianos sounded like mellow harpsichords, and had a damper stop in the left cheek of the case. Zumpe is known as the creator of English square pianos." - (en.wikipedia.org 31.03.2022)
