Sewer wellhead automatic protection device

• Main Authors: LI ZHIHONG, MA HENGZHANG, YUE QIUSHAN, FAN XIAOHONG, ZHANG GUISHEN, CAO LI, ZHANG FENG, HOU JIANLI, ZHANG ZHIHUI, ZHANG CHENGLI, LIU CHAO, XU ZHIQI
• Format: Patent
• Language: Chinese; English
• Published: 13.08.2014
• Subjects: ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTIONOF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, ORTHE LIKE; CESSPOOLS; CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES; FIXED CONSTRUCTIONS; SEWERAGE; SEWERS; WATER SUPPLY