"Friedrich Ladegast (August 30, 1818 – June 30, 1905) was a famous German organ builder.
Ladegast was born in Hochhermsdorf (now Hermsdorf), Saxony, to a carpenter and ...
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cabinet-maker. He worked first for his brother Christlieb, an organ builder at Geringswalde, and built his first two organs at the age of twenty. He then traveled as a journeyman to various workshops, including those of Johann Gottlob Mende in Leipzig, Urban Kreutzbach in Borna, Adolf Zuberbier in Dessau, Martin Wetzel in Strasbourg, and Aristide Cavaillé-Coll in Paris. His work with Cavaillé-Coll was especially influential on his own designs; the two developed a friendship, and Ladegast introduced many technical innovations learned from Cavaillé-Coll´s workshop to Germany, such as swell pedals and Barker levers." - (en.wikipedia.org 23.11.2019)