| 摘要 |
PROBLEM TO BE SOLVED: To fix parts to an inclination surface without using a special attachment. SOLUTION: A screw head part 208 and a screw part 209 are coupled with each other by a spring 210. One end of the spring 210 is welded with the screw head part 208, and the other end of the spring 210 is welded with the screw part 209.
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