As of 9:15 a.m., the 225-issue Nikkei Stock Average lost 52.80 points, or 0.24 percent, from Friday to 21,633.10. The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, shed 2.62 points, or 0.17 percent, at 1,573.69.
Oil and coal product, mining, and electric power and gas-linked issues comprised those that declined the most in the opening minutes after the morning bell. Markets here were closed on Monday due to a national holiday.
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