Bollinger/Bauer: Illegal radio broadcasts
Dr. Heinrich Bollinger and Helmuth Bauer likewise admit that they repeatedly listened to foreign radio broadcasts last winter at a ski hut in Breitnau. They did this together with Elsbeth Duwenhögger, who was still a minor at the time; she resides in Freiburg i.Br., Eck Str. 13.
The proceedings against Miss Duwenhögger are being carried out separately.
Source: Gestapo memorandum in support of indictment, March 23, 1943