| 摘要 |
PROBLEM TO BE SOLVED: To provide a shelf board which can be manufactured at a lower cost, has a good appearance, and is excellent in strength. SOLUTION: When plastic deformation is performed on a steel plate, a groove-shaped, folding part 42 in the back which is open upward along a back edge 41r formed on a main part 41 of a shelf is made as one unit.
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