ฟันเฟือง, ล้อ, การวาดภาพ, เกียร์, กลไก, กลศาสตร์, วิศวกรรม, งาน, การทำงาน, เครื่องยนต์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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