A longitudinally extending support is secured to the table of a table saw to which a guide rail is secured. A saw fence, having a shoe secured thereto, includes a clamping arm extending therefrom. The shoe slidably engages the guide rail and may be clamped together with the fence to the guide rail. A...http://www.google.de/patents/US4206910?utm_source=gb-gplus-sharePatent US4206910 - Table saw fence system
