jan 1, 1811 - Iwan Muller's 13-key clarinet

Description:

Seven keys added
- F/C
- Bb/F
- B/F#
- Eb/Bb
- F/C
- Ab-B trill key

Goal was to further refine instrument by reducing cross fingerings.

This later developed into the modern Oehler system in use in Germany today

See attached: comparison between Muller, Albert, and Oehler clarinets (top to bottom)

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