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Sliding window accessory pvc upvc window rollers
Sep 26, 2017
Plastic steel window specifications, models should meet the design requirements, the quality of Windows and mechanical properties in line with the current national standards requirements, and has factory certification. window of the wind pressure, air infiltration, rainwater infiltration three basic physical properties should conform to the current national standards for the three performance ratings of the provisions and design requirements, accompanied by the level of quality testing reports.

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