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Patent drawing - 73753per - . Public domain image
US. 73,753. H. W. Poole. Key-board for Organs &c. 28.01.1868 Fig.2 Perspective view showing the relative position of all the Keys.
US. 73,753. H. W. Poole. Key-board for Organs &c. 28.01.1868 Fig.2 Perspective view showing the relative position of all the Keys.