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Pinned January 26, 2021 via web
3D CAD MODELS- GB/T 9115.1-2000 PN16 FF - ????????????
zh: GB/T 9115.1-2000 PN16 FF - 平面、突面对焊钢制管法兰
en: GB/T 9115.1-2000 PN16 FF - Steel pipe welding neck flanges with flat face or raised face
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