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There is a page named "File:Axial flow valve on tenor trombone mod1.jpg" on Wikipedia
4.0 Creative Commons Attribution 4.0 truetrue English Tenor trombone with an axial flow valve author name string: Jonathanischoice Wikimedia username:...(1,902 × 1,250 (309 KB)) - 11:25, 15 May 2024
