Tepper and Teelen - looking for info

I am looking for info on my mom's side of the family.  
Mom was born Ruth Ottilie Tepper on June 1, 1921.  Her parents: Konrad Ihle, born September 5, 1897 in Germany, and Auguste Tepper, born July 6, 1898 in Germany, never married each other.  
Auguste's parents: Wilhelm Tepper, born in Denmark, married Auguste Teelen, born in Germany.  I don't know anything further for this branch.  I do know, however, that Wilhelm apparently owned a foundry in Denmark, prior to his getting married and moving to Germany.  I don't know where that foundry was, though.