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In page WBZ (AM):

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Under the provisions of the North American Regional Broadcasting Agreement, on March 29, 1941 WBZ's "clear channel" assignment was shifted to its present frequency, 1030 kHz.[3] WBZ transferred from the Blue Network to the NBC Red Network on June 15, 1942.[10][14] This allowed the station to retain a link with NBC after the Justice Department ordered NBC to divest of one its two radio networks. (It opted to sell the Blue Network, which became ABC, the American Broadcasting Company.) Like other major-market network-affiliated radio stations of the time, WBZ also broadcast a few hours of local programming, including Vaudeville-like musical performances from Max Zides, Tom Currier, and others, during those hours when NBC wasn't feeding programs to affiliates.