Object carriers are provided for use with an object tracking and control system of the type having a storage receptacle with a tray provided with an array of slots for receiving ID tags bearing touch memory devices. A computer-based controller is provided for detecting the absence or presence and identity...http://www.google.com.hk/patents/US6501379?utm_source=gb-gplus-share專利 US6501379 - Object carriers for an object control and tracking system
