| 摘要 |
PROBLEM TO BE SOLVED: To prevent development of a crack and the like and improve mud repellency while ensuring visibility of a marking. SOLUTION: A sidewall surface 2S has a decorative portion 5 comprising serrations 4 by juxtaposed ridges 3. The ridges 3 have broken portions 6 formed along the contour of the marking 7 to indicate the marking 7 in an open face.
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