A guide for a portable power tool such as a circular saw, a saber saw, a router, or the like, for effecting a straight cut in a work. The guide is clampable upon the work, such as a wood plank, and is provided with an angularly adjustable bracket forming a straight edge for guiding the power tool. An...http://www.google.es/patents/US4179965?utm_source=gb-gplus-sharePatente US4179965 - Guide for portable power tool
