| 摘要 |
A storage room for storing an attachment unit is provided with a plate for sheltering electrified portions inside the storage room from outside while the attachme nt unit is not stored in the storage room. A hook is also provided to maintain a state wher e the plate shelters the electrified portions. While the attachment unit is not stored i n the storage room, the hook protrudes into the storage room and is positioned at an area over the plate. When an external force is applied to the plate, the hook prevents the plate from being fallen down by the external force by hooking the plate thereon.
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