| 摘要 |
PROBLEM TO BE SOLVED: To facilitate wiring work on each leg post for supporting an angle part at the rear end of a top board. SOLUTION: A leg post 4 for supporting the undersurface of the angle part of the rear end of the top board is made almost rectangular looking forward in the shape of the cross section thereof and a wiring housing part 12 with an open front thereof is provided at the front end part thereof while a cover member 16 is mounted on the opening part thereof.
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