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The purpose of designing the groove of pen desk is to prevent pen placed in random from slipping from the desk. It is a groove which is 200 mm in length, 20 mm in width, 15 mm in depth and it is from the right edge of the desk in 38 mm and from the surface closing to the people in 248 mm .Its size depends on the place that people put their hands on casually when reading books. Putting a pen in the groove can not only prevent pen from slipping from the desk, but also avoid the trouble that people cant find the pen because of laying it casually.