呼吸保护装置面罩螺纹|沙特标准|EN 148-1

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　　呼吸保护装置面罩螺纹|沙特标准|EN 148-1

　　Respiratory protective devices — Threads for facepieces — Part 1: Standard thread connection

　　呼吸保护装置面罩螺纹第1部分：标准螺纹连接

　　Technical Regulation for Personal Protective Equipment and Clothing