이게 뭐지?？？
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저는 석유 제품의 측정 업무를 하는 사람입니다. 오늘 창고에서 이런 물건을 발견했는데, 어떤 용도인지 모르겠습니다. 아시는 분 계십니까?
마치 다방향 밸브 스위치 같다.맞춰봤어 :)
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