| 摘要 |
PROBLEM TO BE SOLVED: To enhance the commercial value of a building board for use as exterior wall material by providing the surface of the board with an amusing design. SOLUTION: Projecting sections 2 and 3 and flat portions 4 are provided in a mixed arrangement on the whole or a portion of the decorative surface of the building board 1 to provide a three-dimensional design with bright and dark portions.
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