... following :1,SBL target flow meter,the number of patent is ZL0020624.0 2, composite impeller flow meter, ... the number of patent is ZL2008 2 0229319.1.3,composite expanding type ... flow meter,the number of patent is ZL 2008 2 0131223.1.We have ... accuracy.it is our patent product,the number of patent:ZL 2008 2 0101423.2. And the patent name is a ...