Subsidiaries, with the exception of Qwest Management Company (founded as US West Investment Management Company), which became CenturyLink Investment Management Company, retained the Qwest name and adopted d/b/a names. References External links CenturyLink and Qwest Agree to Merge Archive of US West Intercept Messages Bell System Lumen Technologies Telecommunications companies disestablished in 2000 Defunct telecommunications companies of the United States Companies based in Denver Defunct companies based in Colorado Telecommunications companies established in 1983 American companies established in 1983 2000 mergers and acquisitions 1983 establishments in Colorado 2000 disestablishments in Colorado