| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively provide different tops in response to the use and sensitivity of a consumer. SOLUTION: This top is comprised of an external top 2 and a middle top 4, and an engagement recess part 6 to engage the middle top 4 in the center of the external top 2 is formed. A through hole 3 is formed inside the bearing bottom 6a of the engagement recess 6. The middle top 4 is removably engaged and set in the engagement recess 6 of the external top 2.
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