상가 빌딩(남녀화장실 냉온수 배관 녹물제거 - 배관 플러싱 작업) 작업보고서

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https://video.wixstatic.com/video/5e7b7c_cfab8710c4ce44b997533be0afac7bcc/1080p/mp4/file.mp4

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