MSZ 2255-1973 《螺丝主要设备小型六脚螺丝1和2级别精确等级》.pdf

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MSZ 2486-1975 《六头锁螺丝与管流动一和二级别精度等级》.pdf

NC 90-06-04-1984 Metrological Assurance 2 to 4 Category 2 to 5 Class and Conventional Mass Measures 2 to 3 Class Riders Verification Methods and Means《计量保证 2-4类别，2-5 玻璃和传统团块测量 2-3玻.pdf

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