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Summary
DescriptionRotary valve on tenor trombone.jpg
English: Bell section of a Bach 42B tenor trombone, with a rotary valve in F. Clean-up, rotation and crop of CC-BY licensed image File:Corporation-Bach-42B-19009-10.02.2022_0018-13_(cropped).jpg, photographed by Daniel Alessi, 2022. Attribution: www.swisstbone.com
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