Raab was a senior teacher and owned a geoplastic workshop in Fürstenfeldbruck near Munich. There he produced reliefs for various museums in Germany and abroad. In 1938 he was retired.

[1] This article bases on Mair, Toni. Grieder, Susanne. Das Landschaftsrelief – Symbiose von Wissenschaft und Kunsthandwerk. Mit Schweizer Reliefkatalog. Verlag hier+jetzt. Baden, Schweiz. 2006. S.166.