| 摘要 |
PROBLEM TO BE SOLVED: To provide an outer formation of a bolt and a nut with a removal prevention function for the purpose of preventing the bolt and nut from being removed by tampering with. SOLUTION: The bolt and nut are each formed in a curved surface, and can form a semi-ellipsoidal sphere integrated together after attachment. A tightening groove is formed so as not to allow a force to be applied in the loosening direction. COPYRIGHT: (C)2006,JPO&NCIPI
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