In a portable telephone, a main body case and a cover case are connected rotatably by a hinge portion. Further, the main body case is made of a resin material, metal, or a material including metal, and the cover case is made of a metal material. Further, when the portable telephone is used, the cover...http://www.google.com/patents/US20020013159?utm_source=gb-gplus-sharePatent US20020013159 - Portable radio device having a structure for improving antenna characteristic
