Found the following death notice for Herman Dummer. Did not find anything on Henry. "DUMMER--Herman Dummer, 5742 S. Laflin street, June 28, 1943, beloved husband of the late Clara Dummer, fond father of Hattie and Edwin Dummer, and Mrs. Mildred Shanessy, grandfather of Lorraine. At chapel, 63d and Harvard, where services will be held Thursday, July 3, at 2 p.m. Interment Mount Greenwood." Source: Chicago Daily Tribune (1872-1963); June 29, 1943; ProQuest Historical Newspapers Chicago Tribune (1849-1986); page 24.