เทคโนโลยี, เครื่อง, เกียร์, งาน, เชิงกล, กลศาสตร์, อุตสาหกรรม, การผลิต, วิศวกรรม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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