คนงาน, งาน, โครงการ, ผู้ก่อสร้าง, การก่อสร้าง, วิศวกร, สถาปนิก, หมวกนิรภัย, ผู้ชาย, วิศวกรรม, พิมพ์เขียว
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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