A code conversion apparatus includes an input section to input compressed and transformed input codes, a header information rewriting section to rewrite only header information within the codes so as to change a decoded state of the input codes, and an output section to output the codes, including rewritten header information, to a target object such as a display unit and an external equipment. A continuous cord passes through holes on one side of rigid shelves, through a back support bar, through grommets, forming a loop with hook, and back down the other side. The hinge pin and hinge round are securely mated by inserting a security pin, sized to fit, through the hole in the top of the hinge pin.