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Since its founder Mr. Kou Zhongxin realized in 2008 that the renovation of heritage buildings in Shanghai required not only the facade to be repaired as before,but also higher requirements for buildings energy-saving performance of buildings,requiring a complex but extraordinary window opening,system to match the famous buildings of Shanghai in the last century.

Today, Rilang has completed hundreds of projects across the country and is a top manufacturer of doors and windows for historical and cultural preservation buildings, characteristic commercial projects, and boutique private residence.