โทรศัพท์, กรณีฉุกเฉิน, อุบัติเหตุ, ข่าวสาร, สัญญาณขอความช่วยเหลือ, สัญลักษณ์, ใคร, อะไร, อย่างไร, ที่ไหน, ทำไม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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