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In page WBZ (AM):

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WBZA continued to serve Springfield with a simulcast of WBZ's programming until July 1962, when the East Springfield transmitter was shut down to allow Westinghouse to purchase WINS in New York City, as the company already owned seven AM radio stations — the maximum allowed by the Federal Communications Commission (FCC) at that time.[11] The closure of WBZA ended over 40 years of transmission from East Springfield. The towers continued to stand atop the former Westinghouse plant in East Springfield for five more decades, until their removal on November 5, 2011 to accommodate redevelopment at the site of the factory.[12][13] By then, they were among the oldest broadcast facilities still standing.[14]