http://trepanos.blogspot.com.ar/2015/05/como-insertar-una-presentacion.html
http://petroleo-patagonia.blogspot.com.ar/2013/07/trepanos-triconos-pdc-hibridos.html
https://es.scribd.com/doc/94139305/Tipos-de-Trepanos
http://www.taringa.net/post/apuntes-y-monografias/13571845/Informe-sobre-trepanos-para-perforacion-en-petroleo.html
http://infotrep.blogspot.com.ar/
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