Hupfeld consistently invested heavily in advertising and actively used customer references in its promotional materials. This brochure, dating from the later years of the company, presents several owners of Hupfeld Uniola installations as references. The Hupfeld Uniola large-scale sound system, designed for the reproduction of radio broadcasts and phonograph records as well as the transmission of announcements, was primarily used in venues with extensive and widely distributed outdoor areas. This brochure features installations at several notable locations, including the Uhlenhorster Fährhaus, the Elbschloss Brewery in Nienstedten, and Alsterpark.