A lead frame such as a normal or inverted lead frame includes an unsymmetrical part such as a gate. A clamp, for clamping the lead frame during wire bonding, includes an observation hole. The unsymmetrical part of the lead frame is visible through the observation hole. A lead eye box and a lead eye point...http://www.google.se/patents/US6984879?utm_source=gb-gplus-sharePatent US6984879 - Clamp for pattern recognition
