GB /T 2257-1991 The parts and units of jigs and fixtures.Inner hex screw for plastic fixtures

GB /T 2257-1991(GB2257-1980) The parts and units of jigs and fixtures.Inner hex screw for plastic fixtures
国标GB /T2257-1991 GB2257 2257GB(GB2257-19 The parts and units of jigs and fixtures.Inner hex screw for plastic fixtures

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