| 摘要 |
The method comprises the following phases: an elongate strip (11) with parallel edges (12, 13) is cut from a flexible material, and is folded in order to juxtapose these edges; prior to folding, the ends of the strip are cut into two complementary shapes (14, 15); and the two complementary zones (16, 17) which are not of double thickness, are brought over one another, superimposed and assembled in order to form a turned-in keeper without an excess thickness. <IMAGE>
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