As of 9:15 a.m., the 225-issue Nikkei Stock Average added 63.18 points, or 0.22 percent, from Tuesday to 29,091.12.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, edged down 0.04 point at 1,917.64.
Electric appliance, pharmaceutical and precision instrument issues comprised those that gained the most in the opening minutes after the morning bell.
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