(ภาษาไทย) จ้างออกแบบปรับปรุงโครงการเดินสายไฟและติดตั้ง Wall Plug บริเวณโถงทางเดินภายในและภายนอกอาคารศูนย์ประชุมและเเสดงสินค้านานาชาติ

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