Invention Patents
Total 45 Patents of invention and 24 Registrations of Design, 5 Utility models
Improved frost proof yard hydrant
Wall Sleeve for construction
Height Adjustable piping sleeve
Water meter box body
Improved manhole for construction
Manhole cutting off bad smell
Warming stopper of water meter box
Floor drain
Devices for preventing smell for drainage manholes
Height control structure of manhole
Sealing structure of insulation materials put in water meter boxes
Frost proof yard hydrant with replacement function