I doubt that this will help. However, my grandfather (Fred
Miller Coulter) moved to Beulah,
Michigan from
Indiana in the 1940's. He was married to Rosa Victoria
Proffitt. Their only son, Fred
Proffitt Coulter, also moved to
Michigan at the same time.
So, they are relatively recent
Michigan Coulters, probably too recently for you. I'll be happy to send you more information if you think it'll help.