| 摘要 |
An external door body is formed of first and second guide grooves for gripping left hand and right hand edges of a front panel, and an arcuate receiving groove for gripping an upper edge of the front panel. The front panel is inserted into these grooves, and a stopper acting as a closing device is finally attached to a bottom portion of the external door body to prevent the front panel from falling off. At the installation, the front panel need not be forcibly folded, so that the work can be made easily while eliminating the damage of the front panel.
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