"Square Heads " CNS Standards List| Information security, | Circular Surface | Chemical Reagent | Method Test | Fire resistance | Reproducing Discrete | Method Test | Household similar | |
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CNS 66
2017 Edition Square Heads and Holes (for Shaft, Hand Wheel and Handles) 方頭及方孔（用於軸，手輪及手柄） |
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CNS 66
1972 Edition Square Heads and Holes (for Shaft, Hand Wheel and Handles) 方頭及方孔（用於軸，手輪及手柄） |
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