Moved to Switzerland in 1935: https://www.recherche.bar.admin.ch/recherche/#/fr/archive/unite/3578994
https://www.mappingthelives.org/bio/9cd75950-68dd-47c7-9fa9-104433e4b08d
18/1965_00025 Feith, Rudolf, 1933-1937 (Akte)
https://scope.mannheim.de/detail.aspx?ID=755472