Dayton, which signed-on in March 1949; and WLWI (channel 13, now WTHR) in Indianapolis, which opened in October 1957. These four inter-connected stations were branded on-air as the "WLW Network", and their call letters were stylized with hyphens to further reflect their connections to each other—the Cincinnati station, the group's flagship, was known as "WLW-T". Crosley also owned WLWA (now WXIA-TV) in Atlanta (purchased in 1953 and sold in 1962) and WOAI-TV in San Antonio (acquired in 1965, sold in 1974). The three WLW television stations in Ohio were NBC affiliates, and carried common programming along with WLWI in Indianapolis (an ABC affiliate). Most of these shows were produced at the WLWT studios on Crosley Square, and included The Ruth Lyons 50-50 Club (later hosted by Bob Braun after Lyons' retirement in 1967), the Paul Dixon Show and Midwestern Hayride; some of these programs were syndicated regionally to other stations outside of the Crosley group. In 1957, WLWT became the first station in the Cincinnati market to begin color television broadcasts. It later became the first station in the nation to broadcast entirely in color, giving Cincinnati the nickname "Colortown U.S.A." by 1962. For a period during the 1970s, the station's slogan was "5, The Originator", in reference to all of the local programming that was produced by the station. The Crosley broadcast division took the name of its parent company in 1968, becoming Avco Broadcasting Corporation. In 1969, the FCC enacted its "one-to-a-market" rule, which enforced a ban on common ownership of AM radio stations and television stations with overlapping coverage areas under certain conditions while grandfathering some already existing instances. Avco's ownership of WLW radio (a 50,000-watt, clear-channel station) and WLWT, and the Columbus, Dayton and Indianapolis television stations was initially protected under the new rule. While WLWT's channel 5 potential coverage area covered a large amount of the Dayton and Columbus markets, the station was forced by the FCC to transmit with a shorter broadcast tower, thus reducing the signal overlap between WLWT, WLWC, and WLWD. Later years In the mid-1970s, Avco decided to exit broadcasting and sold all of its stations to separate buyers. WLWT was the next to last to be sold, going to Multimedia, Inc. in March 1976."Liquidation of Avco group nears the end" Broadcasting, June 16, 1975, pp. 38-39. Accessed February 12, 2020. As a result, the stations all lost their grandfathered protection,