NF L81-323-1978 Aircraft receptacles for jacking pads and mooring rings metric ISO thread profile and tolerances 《千斤顶垫和系留环用飞机承座 米制ISO螺纹牙形和公差》.pdf

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NF L81-323 A1-1980 《千斤顶垫和系留环用飞机承座 米制ISO螺纹牙形和公差 修改件1》.pdf

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