โลหะ, ประกายไฟ, การก่อสร้าง, งาน, การทำงาน, อุตสาหกรรม, เหล็ก, อาชีพ, โรงงาน, ความร้อน, อุณหภูมิ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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