The model CNC-EF3x2 developed by Vancura Innovations is designed to aid in the finding of the edge of non-conducting materials like plastics and wood. Rugged all aluminum construction with convenient screw for attaching a ground wire. Compatible with MACH3 CNC software.
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I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
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