การก่อสร้าง, งาน, เวที, นั่งร้าน, หน้าตึก, หุ้ม, ทางเข้า, ความปลอดภัย, หมวกแข็ง, ผู้ปฏิบัติงาน, อาคาร
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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