เกียร์, ฟันเฟือง, เครื่อง, ล้อเฟือง, กลไก, ด้านอุตสาหกรรม, ออกแบบ, 3d, วิชาการ, ล้อ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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