Chocolat Kohler
![Kohler chocolate factory at Sauvabelin with the mill on the Flon river (1860)](https://upload.wikimedia.org/wikipedia/commons/c/cc/Sauvabelin.jpg)
Kohler notably introduced hazelnut chocolate, which was perhaps the first combination chocolate bar. Provided by Wikipedia
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63by Köhler, Peter, Hartmann, Jens, Wolf-Gladrow, DieterGet access
Published in Proceedings of the National Academy of Sciences (2010)
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