What's the difference between European concealed hinge and exposed hinge

The concealed hinge can only be opened 50 degrees, and the open hinge can be opened 180 degrees. Generally, the anti-theft door can make the hinges outside the highest level of class a anti-theft. Jingjing anti-theft class A is all outside, which is suitable for seeing light on both sides, and can not see the door page of any hole. The concealed hinge is mostly used in furniture, which can be divided into hydraulic, quick installation, frame door and ordinary door. The above data are for reference only.