NF E29-902-3-1997 Flanges and their joints Dimensions of gaskets for PN-designated flanges Part 3 non-metallic PTFE envelope gaskets 《法兰及其接头 按PN标识的法兰用垫圈的尺寸 第3部分 非金属聚四氟乙烯封装垫圈》.pdf

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