known as the Cincinnati and Suburban Telephone Company Building. It was added to the National Register of Historic Places in 1995. Next door is a data center operated by CyrusOne, a former Cincinnati Bell subsidiary. It originally opened in 1975 as Cincinnati Bell's central Switching Center. Cincinnati Bell owns the naming rights to the Cincinnati Bell Connector streetcar line that traverses the downtown area. In August 2016, Cincinnati Bell paid $ to rename the line for 10 years. From 2007 to 2014 Cincinnati Bell also sponsored the annual Cincinnati Bell/WEBN Riverfest, one of the largest fireworks displays in the Midwest. See also American Telephone & Telegraph Bell System Bell System divestiture Ohio Bell References External links Bell Operating Companies (from Bell System Memorial) Bell System Internet service providers of the United States Broadband American companies established in 1873 Telecommunications companies established in 1873 Companies based in Cincinnati Companies formerly listed on the New York Stock Exchange Communications in Indiana Communications in Kentucky Communications in Ohio 1873 establishments in Ohio 2021 mergers and acquisitions Private equity portfolio companies Privately held companies based in Ohio