| 摘要 |
PROBLEM TO BE SOLVED: To prevent a burglary by making a frame or the like hard to detach once it is attached at the time of attaching it to a wall. SOLUTION: By attaching a lock spring 2 together with a hooking fitting 1 to the frame, the lock spring 2 is hooked to the head part of a hooking screw 3 and detachment is made impossible.
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