밸브에 대한 영국 미국 표준은 무엇을 의미합니까?
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씰 풀 포트 화재 안전 WR OP
우선, 단지 추측일 뿐이며 정확성을 보장할 수 없다는 점을 설명하겠습니다. P SEALS 씰 FULL PORT 풀 보어 FIRE SAFE 방화 WR 용접 OP 수동 조작
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