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| Keywords: 1811wornumpatentdrawing1figc.png en Drawing representing the front view of patented piano from the specification of the English patent granted to Robert Wornum the younger dated March 26 1811 Figure C Drawing 1 Robert Wornum the younger An improved upright pianoforte English patent 3 419 March 26 1811 Robert Wornum 1811-05-22 also reproduced by Rosamond Harding The Piano-Forte Gresham Books Old Woking Surrey 1977 PD-old-100 Parts of pianos | ||||
