| 摘要 |
Disclosed is a mobile communication terminal having an upper case coupled to a lower case. A primary rib is formed on the inner sides of upper case's edges and a plurality or secondary ribs is formed along the inner sides of the lower case's edge. The plurality of secondary ribs engages the primary rib when the upper case is coupled to the lower case. Grooves are formed on the top surfaces of the ribs to interlock and prevent lateral and longitudinal movement of one case with respect to another.
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