What materials are needed to apply for Grade B surveying and mapping qualification in Henan? What materials are needed to apply for Class B surveying and mapping qualification in Henan? Henan Kuanxin Wang Gong: 182 Telephone 3713 Tel. 1897QQ: 221 Enterprise 0257 Goose 580 Enterprise Qualification Maintenance/Qualification Upgrade/Enterprise Application Qualification and Engineer