(ภาษาไทย) ประกาศผู้ชนะการเสนอราคา จ้างเปลี่ยนสารกรอง ถังกรองกายภาพ ของถังเก็บน้ำ คสล. จำนวน 2 จุด โดยวิธีเฉพาะเจาะจง

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