ktm_bis: साधारण यन्त्र : उत्तोलक, घिर्नी, छड्के स..

Posted by: ktm_bis November 27, 2007

बिज्ञानको सुत्रहरु

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साधारण यन्त्र : उत्तोलक, घिर्नी, छड्के सतह, पेच

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