전기용접 기능사 실기 9T 수평 SMAW horizontal position
Korea Welding Certification
horizontal position V groove butt welding
9T-150mm
Видео 전기용접 기능사 실기 9T 수평 SMAW horizontal position канала Red hand
horizontal position V groove butt welding
9T-150mm
Видео 전기용접 기능사 실기 9T 수평 SMAW horizontal position канала Red hand
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