ความปลอดภัย, แน่ใจ, การป้องกัน, Osh, บันทึก, hinweisschilder, ตัวบ่งชี้, ป้ายฉุกเฉิน, ป้ายความปลอดภัยจากอัคคีภัย, สัญญาณห้าม, สัญญาณบังคับ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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