LINKS

algunos hay que descargarlos as pdf file espero y les sirban      


    http://www.thesheetmetalshop.com/library/Triangulation_F_S_Kidder.php ese esta muy perron.






http://www.thesheetmetalshop.com/pdf_manual/ElbowPatterns_Kidder.pdf ese de puros 90s






http://www.thesheetmetalshop.com/library/The_Metal_Pattern_Worker_Book.php