As of 9:15 a.m., the 225-issue Nikkei Stock Average added 354.99 points, or 1.55 percent, from Wednesday to 23,198.95.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 17.15 points, or 1.07 percent, at 1,622.68.
Precision instrument, mining, and glass and ceramics product issues comprised those that advanced the most in the opening minutes after the morning bell.
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