Luoyang Petrochemical's two patent applications were granted patents through the examination of the State Intellectual Property Office. These two patents are "an automatic low-pressure storage tank pressure relief device" and "a new type of crane tube loading system sealing device." Hydraulic Catwalk,Automatic Hydraulic Catwalk,Automatic Hydraulic Pipe Conveyor,Automatic Hydraulic Catwalk Light Workover Sinotai Petroleum Equipment Co.,Ltd , https://www.sinotaigroup.com
