An on-line detector for peach pits and peach pit fragments and the like remaining in peach halves following a pitting operation includes a sealed housing bordered on one side by an inclined view plate disposed between a feeding belt and a take-away belt. A peach half, pit cavity down, is passed by a...http://www.google.de/patents/US4146135?utm_source=gb-gplus-sharePatent US4146135 - Spot defect detection apparatus and method
