| 摘要 |
A composite material (16) comprising a polymer (17) as matrix and a metal structure (10) as a reinforcing element, characterized in that said metal structure (10) comprises two metal springs (12, 14), said springs (12, 14) being wound in opposite directions, said springs having coil parts which alternate with each other along the length of the metal structure, said springs being rolled so as to form a flat shape.
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