| 摘要 |
PROBLEM TO BE SOLVED: To provide a bolt that is superior in design, can fix an object with large area to a main body by a single person, and can be treated in a very narrow working space. SOLUTION: A bolt has a polygonal concave or convex, or side hole on the tip opposite to a bolt head 1. With this tip fixed, a tightening nut is screwed, or with the tightening nut fixed, this bolt tip is screwed, so that the main body and the object are tightly fixed.
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