| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lightweight insert metal. Ž<P>SOLUTION: A structure is adopted such that the thickness is increased to ensure the strength for an area which receives a caulking load acting from a caulking part 6a of an outer shell 6, while the weight is reduced for the other part, compared with a conventional insert metal. According to this, the insert metal can be reduced in weight as the whole. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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