| 摘要 |
The device has a flexible thong (1) with a notching, and a stopping (4) maintained at one end of the thong. A unidirectional sliding cursor (5) has a locking area delimited with a carrier stopping (14). The carrier stopping of the cursor cooperates with lateral edges of the thong to provide a partial locking. The notching has a series of grooves opposed two by two and regularly distributed, and a rack.
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