اذا لم تجد ما تبحث عنه يمكنك استخدام كلمات أكثر دقة.
Elementary principles of drill jigs, by E.R. Markham.--Drilling jig plates, by J.R. Gordon.--Examples of drill jigs.--Dimensions of standard jig bushings.--Using jigs to best advantage, by B.P. Fortin and J.F. Mirrielees