| 摘要 |
Inserting hole of key(13) is set to the inside position of the flange(14), key-groove(21) is also set to the surface of plug(2) to fix a flexible key(6). The [-shaped deep groove(26) lie in the inside of cylinder directed to the circle, and coupling plug(2) has regularly a rising hook(23) in the inside of a handle-part(24).
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