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French Horn made by Alexander, (unlacquered instrument), with Rotary valves, and B flat valve Stock Photo - Alamy
Bb trumpet, rotary valves
Bb trumpet, rotary valves
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Rotary valve - Wikipedia
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American Rotary Valve Instruments — Robb Stewart Brass Instruments
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Elements of Brass Instrument Construction: Rotary Valves
Mini Bb Pocket French Horn – 3 Rotary Valves | Tempest Musical Instruments
