During the 1700s, the clarinet went under lots of improvements and innovations. The cut or shapes of the holes were experimented on to see how it affects the sound of the clarinet. The keys were also altered; Iwan Muller developed the 13 key models.
In the 1800s, the Boehm fingering system that was developed by Theobald Boehm for the flute was used for the clarinet by Hyacinthe Klose and Auguste Buffet. This is the same fingering chart this is used today, but there are other fingering systems being used.
CHALUMEAU, 1680
First Basset Horn (Bass clarinet), 1770
Moussetter,