สัญญาจ้างเหมาดูแลปรับปรุงภูมิทัศน์และระบบสปริงเกอร์ภายในพื้นที่ศูนย์ประชุมและแสดงสินค้านานาชาติเฉลิมพระเกียรติ 7 รอบพระชนมพรรษา

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