National Music Museum (NMM) - Register key on clarinet in B-flat by Noblet, Paris, ca. 1960-1965. Stubbins model. Boehm system with S-K B-flat mechanism. From the collections of the National Music Museum (
Backun Q Series A Clarinet (key of A)
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How to play the A note in tune on clarinet (just the register key and covering no holes) - Quora
Optional "register" key on a vintage Buffet bass clarinet? | Sax on the Web Forum
Bass clarinet - Wikipedia
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Does anyone have any idea what kind of clarinet this is? (It's an older A clarinet of unnamed manufacturer and is normal except for this register key). : r/Clarinet