Hello Pat,
I am also researching Johann Adelmann B: 17 Feb 1855, and his spouse Rosalia Pfister B: 1855. Actually, I am researching Anna Adelmann B: 30 July 1884's husband, Phillip Joe Theiss B: 5 Dec 1878 Austria-Hungary.
I have the marriage date for Johann Adelmann & Rosalia Pfister as 21 Jan 1879 (Johann was age 23).
You can check my progress on the "THEISS" family tree.
If any of you have any documentation/photographs, I would be very happy.
Happy Hunting!