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Cov neeg ua haujlwm sab saum toj hauv tsev thev naus laus zis, hauv hexagon-shaping, clipping, xov-dov, carburize, zinc plated, tshuab ntxhua khaub ncaws, pob thiab lwm yam txheej txheem, txhua qhov txuas sib zog ua kom tiav thiab qhov zoo tshaj plaws.
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