Christian August Seydel founded the C. A. Seydel Söhne harmonica factory in Klingenthal, Sachsen in 1847. The firm remains the oldest harmonica factory in the world and manufactures a wide range of harmonicas.

The harmonica, also known as a French harp or mouth organ, is a free reed wind instrument used worldwide in many musical genres, notably in blues, American folk music, classical music, jazz, country, and rock. The harmonica was developed in Europe in the early part of the 19th century.

In the 17th century, the Seydel family was miners in Sachsenberg-Georgenthal/Saxony. When mining ceased in Saxony Vogtland, the brothers Johann Christian Seydel and Christian August Seydel began working as instrument makers. Both subsequently became approved harmonica makers. This was decreed by the Court of Untersachsenberg on October 27, 1847.

The certificate contains the first documented reference to the company, with Christian August Seydel being registered as the company founder. The factory was established in Klingenthal at the foot of the famous Aschberg (literally ‘Ash Mountain’) and became one of the biggest harmonica factories in Saxony. In 1882, C.A. Seydel died, and his son Richard took over. One year later his brother Moritz joined them, and the company name changed to C.A.Seydel Söhne (C.A. Seydel and Sons).

According to Wikipedia