English: Drawings of Adolphe Sax's saxtubas on French Patent (Brevet d'Invention) 4361
References
Clifford Bevan (1990). "The Saxtuba and Organological Vituperation". The Galpin Society Journal43 (Mar., 1990): 135-146. Galpin Society. "On 5 May 1849 Adolphe Sax was granted French Patent 4361 for ‘Wind Instrument’ (see Fig. 1). He made amendments in a cerificate dated 20 August 1849 and notified further changes in anoter of 23 April 1852. ... FIG. 1. ‘Instruments à vent, par M. Sax’ (from the drawings accompanying Brevet d'invention 4361 of 5 May 1849)."
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