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Rotary valve with articulated crank action, in normal position (left), and with American string action, depressed (right): a – outer casing, b – rotor, c – valve slide; arrows show direction of air from mouthpiece to belllocked

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Rotary valve with articulated crank action, in normal position (left), and with American string action, depressed (right): a – outer casing, b – rotor, c – valve slide; arrows show direction of air from mouthpiece to bell

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