Karl Nothelfer did not build much in Singen. In 1952, he also built the administration building of the aluminum rolling mill in Singen, with relief and wall painting by C. G. Becker. In Überlingen he built, among others, the Buchinger Sanatorium, the Riese+ Hähnel radio house and various reconstructions in the old town: Haus Kitt with the Glockenspiel, the Haus mit dem Bacchus in the Überlingen village, the Dolphin Fountain in Hödingen (1975).
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