| 摘要 |
The ring (1) is joined to a first element (2) in which the lower part of the finger is slid. A second element (3) is articulated on the first element, and the centre of the finger is slid into it. The first and second elements are open at the bottom but their sides are folded inwards. The articulation is formed by a sleeve (4), in the arc of a circle, which is articulated (5) on the second element. A curved rod (6), articulated (7) on the first element, slides in the sleeve.
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