ONORM A 8080-1979 Controls (operating dements) Terms and definitions suitability designing Instructions《控件（控制元件）术语和定义，适应性，设计指导》.pdf

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GB T 6567.4-2008 技术制图.管路系统的图形符号.阀门和控制元件.pdf

GB T 6567.4-1986 管路系统的图形符号 阀门和控制元件.pdf

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