| 摘要 |
The interior of a case body is partitioned into two chambers by a partition wall, and the two chambers communicate with each other via a communication passage defined by a notch formed in the partition wall. First and second covers are attached to the case body, and cover open sides of the two chambers, respectively. The first and second covers have lap portions, respectively, which cover an open end of the communication passage in overlapping relation to each other.
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