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Fundamental frequency (f0) values for 4 octaves of a piano keyboard... | Download Scientific Diagram
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Henri Hertz, magnat du piano : la vie musicale en France au XIXe siècle (1815-1870) - Laure Schnapper - Librairie Mollat Bordeaux
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Do the 88 keys of a piano cover the full range of frequencies that the human ear can perceive? - Quora
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Fichier:Piano art nouveau (1900), piano by Henri Hertz, sculpture by François-Rupert Carabin, Musée des Arts Décoratifs.jpg — Wikipédia
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