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Twelve bell trumpet, by A. Sax

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Developped by Adolphe Sax son, the thirteen  bell / eight valve trumpet is, in theory, a perfectly tuned instrument as each semi-tone owns his own acoustic circuit.
This model, built around 1900, is presently exhibited in the Selmer Paris show-room. It was found with some others in the A. Sax factory, after the 1929 buy out.