Shanghai Jiading District No.30 Conference Systems No.80 Forms Sheet Machines Duo Media Technology Systems Engineering System Integration Zhong Yang Control Systems Duo Mei Ti Jiao Office Conferencing Audio Systems Automation Technology Automation 中关村高新技术企业 国家高新技术企业 高新技术企业 科技型中小企业 省级创新型中小企业 市级创新型中小企业