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The large, continuously upgraded satellite ground stations, originally installed in 1972 to provide live coverage of the visits to China by U.S. president Richard M. Nixon and Japanese prime minister Kakuei Tanaka, still served as the base for China's international satellite communications network in the mid-1980s. By 1977 China had joined Intelsat and, using ground stations in Beijing and Shanghai, had linked up with satellites over the Indian and Pacific oceans.