this design is the use of the chamber on the support bracket and the bracket, so that occurrence of cracks or corrosion, the farm in order to prevent the loss of all, with (2), (3) to prevent the black polyethylene or a luminous agent, opaque pigment. and don't materials and blending, coating, plastic treatment, reduce costs and reduce labor costs and other economic factors in the village's income certificate to be able to contribute to all of a sudden the characteristics.
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