... line of "Shenzhen green city new building material Corporation" was put to use.2. July of 2006 ... sand AAC line of Zhejiang Zhongxia new building material Corporation" was put to use.5. March of 2009 ... AAC line of Guizhou Longyuan new wall building material Corporation" was put to use.6. February of 2010 ... sand AAC line of Huangshi shenzhou new building material Corporation" was put to use.7. March of 2011 ...