D3-Eb3. Ewell, Terry B. (April 28 1995). Sources unknown.

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 c#-tr w-lock
  (D-tr)

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    w

o  x  x  | o o o
 c#-tr w-lock 

 eb-tr
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   w       F#


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Heckel-System (German) Bassoon Trills and Shakes by Note Names