If you are researching this family, please be aware of the different spellings of the surname.
In the 1910 census his surname is indexed under BUTTNER. The WW I Draft Registration Cards he is Edward Oscar BUTTNER. In the 1920 census it is BUTTNER with the two dots above the "u". In 1921 on his marriage record it is BITTNER. In the 1930 census it has been transcribed as BIITTNER, which is also the "u" with the two dots above it. In the 1940 census he is indexed under BUTTNER with the two dots above the "u" again.