As of 9:15 a.m., the 225-issue Nikkei Stock Average gained 396.09 points, or 2.05 percent, from Thursday to 19,686.29.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 13.24 points, or 0.93 percent, at 1,435.48.
Precision instrument, air transportation and electric appliance issues comprised those that gained the most in the opening minutes after the morning bell.
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