CNS 4375-1987 Butterfly Nuts《蝶形螺帽》.pdf

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NBN E 29-301-1988 7500 《工业阀门 钢质或铁质的，高弹体密封的一般用途的蝶形阀》.pdf

MNOSZ 2423-1956 《蝶形螺母》.pdf

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TCVN 4223-1986 Fly nuts《蝶形螺母》.pdf

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