Be sure to consider Milwaukee's German newspaper collection for researching this family group. For instance Valentine Nessmann placed Marie Sarnitz Nessmann's death notice in these papers in 1942, and Marie was apparently very involved with Milwaukee's Austrian community as 2 of the women's clubs placed notices in these papers as a tribute to her (Oestrr. Frauen K. U. V. Edelweis & Doppeladler Frauen K. U. V.). There was also a wedding anniversary clipping for the couple in 1929.
There are about 15 Nessmann, 80 Schnabl / Schnabel, 18 Schuller entries or references found in the local resource "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007...