| 摘要 |
PROBLEM TO BE SOLVED: To prevent an unexpected impact sound generated when closing the door body of a mailbox or the like. SOLUTION: Contact plates 3 and 3' provided with spaces 2 and 2' from the reverse edge parts of door bodies A and A' are rockably protrusively formed on mounting base parts 1 and 1' mounted on the inside of the opening-side edges of the door bodies A and A'.
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