E.T. Horn Company has announced the promotion of Bob Ahn to president of the Industrial Groups, and Vince Anderson to vice president of the Coatings and Building Materials Group.      Mr. Ahn was previously vice president of sales for the Coatings & Buildings Materials Group. He started with E.T. Horn in May 1996.      “Ahn’s skills in managing principal and customer relationships have helped to drive the growth of our Coatings Group for more than a decade,” said Jeff Martin, E.T. Horn p...