| 摘要 |
PROBLEM TO BE SOLVED: To solve the point at issue that not only a decorative section is damaged but also labor and the time are required in conventional disconnecting works by a hammer, pliers or the like. SOLUTION: The cover frame is disconnected simply in a short time without damaging by works from the inside of a small-bore periphery by the tool, efficiency is improved and works at a narrow place can be facilitated.
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