코크스화 4방향 밸브
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이 게시글은 마지막으로 ‘연유공인’이 2016-10-2 15:09에 수정했습니다. 사통밸브가 제자리에 오른 후에, 왜 바늘이 다시 1센티미터 정도 뒤로 돌아가는 걸까요?http://bbs.hcbbs.com/thread-983730-1-1.html
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