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PDF) Szász, Tibor. Performance Practice, Stylistic Considerations (1700-1900) in Encyclopedia of Keyboard Instruments, Robert Palmieri, Piano, Routledge (2003), section P, pages 274-278
PIANO VERTICAL ALEMANIA, CA. 1900 Marca G. SCHWECHTEN Hof-Piano-Forte Fabrikant, Berlin. Con la leyenda: "Expresamente fabri... for sale at auction on 19th September | Bidsquare
A. Graichen Antique Upright Piano from 1864 Germany | eBay
A. Graichen Antique Upright Piano from 1864 Germany | eBay
Piano makers | The Piano in Polish Collections
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A. Graichen Antique Upright Piano from 1864 Germany | eBay
A. Graichen Antique Upright Piano from 1864 Germany | eBay
Ernst Kaps Piano Makers
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A. Graichen Antique Upright Piano from 1864 Germany | eBay
Beetz Collection
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Piano makers | The Piano in Polish Collections
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