วิศวกร, ชาย, หมวกนิรภัย, ผู้ปฏิบัติงาน, คน, ธุรกิจ, วิศวกรรม, การก่อสร้าง, มืออาชีพ, สถาปนิก, งาน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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