... sell these Patent hinges. US. Patent frame backboard 6220DL easel hinge Many years ago, Craft Inc. introduced the first patented ... Asia. Over the years, Craft has never stopped improving our hinge design. Now after years of research and development, Craft ... Stop System" improves the hinges' stopping strength while giving the hinge barrel a cleaner, more appealing look.Packing12,000pcs/carton, carton ...