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*Masaru Sakamura
Hiroshima prefectural technology research institute
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Kaoru Ohishi
Hiroshima prefectural technology research institute
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Kohei Ota
Hiroshima prefectural technology research institute
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Shigeyuki Mizunari
Hiroshima prefectural technology research institute
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Yoshihiro Takeyasu
Hiroshima prefectural technology research institute
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Hidetoshi Fujii
Joining and Welding Research Institute, Osaka University