لا توجد دقة أعلى متوفرة.
Screw_and_trough.gif (220 × 80 بكسل، حجم الملف: 69 كيلوبايت، نوع الملف: image/gif)
Screw and trough.
http://www.osha.gov/SLTC/etools/machineguarding/animations/trough.html
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