| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the insertion and the hooking of a thread to a hook for tensioning the thread for preventing bird injury, and further to hold the hook vertically. SOLUTION: A through hole opened at one side edge is formed at the upper part of the hook, and a protrusion for hooking the thread is protruded from the other side edge. A leg plate sandwiched between a crosspiece and a joint plate for supporting the crosspiece is installed in the lower end of the hook.
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