I'm not sure if you're still looking for information re: this inquiry.
My great-grandfather was Gustav Ax. He is buried in the cemetary in Manistee, Michigan. On his gravestone, his name is spelled "Gustaf", and also shows the dates 1867-1937. My great-grandmother is also on the same gravestone. Her name was Augusta, and the dates were 1868-1949.
I have no information on Emanuel or Mary, but would be interested in any other information that you have re: Gustaf/Augusta.
Thanks!
Ann Komorowski