プラント溶接

Puranto yōsetsu

橋梁工場溶接

Kyōryō kōjōyōsetsu

鉄骨工場溶接

Tekkotsu kōjōyōsetsu

鉄骨AW 現場溶接

Tekkotsu AW Genba yōsetsu

AW 鉄骨溶接

AW Tekkotsu yōsetsu

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