Coatema Coating Machinery GmbH on Aug. 1, appointed Dr. Markus Deimel as managing director.    He will be responsible for the management of the company together with Dr. Tarik Vardag, managing director of the ATH Group.    Although Dr. Andreas Giessmann and Detlev Dieke will leave the company as managing directors at the end of the year as planned, they will continue to work as consultants in the ATH group thereafter.    Mechanical engineer Dr. Deimel, 45, has extensive experience in...