1902—London, England

Boosey & Co. offer valve alto trombones in F and E-flat, valve tenors in C and B-flat, and valve basses in A-flat, G, F, and E-flat. By 1923, the only valve trombones they offer are tenors in B-flat and basses in E-flat, F, and G (Baines, Brass 64).*

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