Organs

The famous Nollet organ builders:

Facteur d' Orgue (or organ builder) is a craftsman (or a trade) that specializes in the manufacture and maintenance of complete organs and many parts used in their construction. Depending on the importance of maintenance, it is called dusting, lifting, restoration (often the same), reconstruction. 

This job requires the mastery of many disciplines, including carpentry, mechanics, work and metal forming, skins and plastics, electrical and electronics, computers, and musical knowledge and acoustic very serious. It is listed among the trades and crafts of art; one of these artisans is harmonist which, on the spot where organs, Adjusts to the acoustics of the place.