By collecting old tennis rackets, balls and other items from the history of tennis, their sale, Exchange, pricing, he is active in more than 15 years. He is a president Golf and Tennis History Association z.s. . This association operates as these websites as a web oldgolf.cz (which is the only author Dan Mikulička and devoted to the history and collecting from the world of golf), which also operates a unique e-shop with historical golf and tennis items. Dan Mikulička is a member of Euro Tennis Collectors Group. Signyficantly he helped to build and open a Museum of tennis rackets in Bratislava like a supplier and curator. He cooperates with film productions, which adds historical sports equipment for filming. In these pages, he devotes to producers of tennis rackets from around the world and tennis collecting.