A system for aligning the bit of a hand-held tool with the surface of a workpiece wherein a laser beam essentially parallel to the axis of the bit is projected forwardly toward the workpiece and onto a mirror maintained at a preselected angle to the workpiece surface. The incident beam is reflected backwardly...http://www.google.com/patents/US20020164217?utm_source=gb-gplus-sharePatent US20020164217 - Alignment system for hand-held tools
