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槽鋼 - 棒料尺寸 ASTM A-36 Merchant Quality 輕量級槽鋼 Stair Stringer Channels ASTM A-36 ASME SA-36 58,000 PSI 80,000 PSI STOCK LENGTHS - 20', 30' and 40' D. Wexler & Sons…

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