New Dörfler & Jörka (D&J) research/page
I am very pleased to unveil the newest in my 2026 research: the analysis of the Dörfler & Jörka (D&J) data I published earlier this …
baritone sax
Hammerschmidt octave patent
Originally published in 2024. Updated March 2026 German patent application Background Summery Figure 1 Figure 2 Patent claims Photos of Hammerschmidt octave vents 1961 Hammerschmidt …