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hangzhou expansion seam company - a factory enterprise specializing in the production, research, development, manufacturing and sales of building deformation seam devices. the main products include: hangzhou expansion joints cost one meter, hangzhou construction expansion joints, floor deformation joints, interior wall deformation joints, ceiling deformation joints, exterior wall deformation joints, roof deformation joints and other deformation joints. hangzhou deformation joints are mainly composed of continuous extruded high-strength aluminum alloy frames and matched with
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