| 摘要 |
PROBLEM TO BE SOLVED: To impart interest patterns with proper variation to a building board without collapsing the keynote of the block-like patterns of breaking join-like patterns. SOLUTION: The stage parts 2 of lateral joint grooves 3 of multiple lines and multiple stages are demarcated, and while the keynote of the block-like patterns of the breaking joint-like patterns in which a plurality of projected blocks 5 are arranged on each stage part 2 through vertical joint grooves is maintained, the positions of the vertical joint grooves 4 every one stage are shifted at random so as not to be overlapped with a vertical axis. COPYRIGHT: (C)2005,JPO&NCIPI
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