Internetagentur Graf - Bochum

Marketing Graeff - Bergisch Gladbach

Ashley Hart Marketing - New York, New York

Tug Agency (Toronto) - Toronto, Ontario

Bartsch u. Haeseler Musikverlag - Hartheim am Rhein

Hart Inc - Washington, District of Columbia

Hart Agency - Melville, New York

Hart Marketing -

Obergfell GmbH - Eschbronn

Hart & Soul Marketing -