DescriptionThayer valves (independent) on bass trombone.jpg
English: Bell section of an S.E. Shires "Lone Star" bass trombone, with two independent (Thayer) axial flow valves in B♭/F/G♭/D. Clean-up, rotation and crop of CC-BY licensed File:Shires-Lone-Star-03.04.2022-4.jpg, photographed by Daniel Alessi, 2022. Attribution: www.swisstbone.com
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Captions
Bass trombone with independent F and G♭ axial flow valves