อาคาร, หมวกนิรภัย, ผู้ปฏิบัติงาน, ด้านอุตสาหกรรม, อุตสาหกรรม, ความปลอดภัย, มืออาชีพ, ผู้ก่อสร้าง, การทำงาน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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