(ภาษาไทย) ประกาศผู้ชนะการเสนอราคา จ้างซ่อม, เปลี่ยนอะไหล่ระบบเครื่องขยายเสียงประจำรถลากพ่วง 14 คัน โดยวิธีเฉพาะเจาะจง

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