A tracking system for identifying contents of a container includes an electromagnetic identification apparatus that provides an electromagnetic signal indicative of a container content data set; a writer for use in encoding the container signal onto the apparatus; a controller for receiving the encoded signal and for storing the signal in a master database storage apparatus; and a reader configured outside the container for communicating with the electromagnetic identification apparatus and for receiving the encoded signal therefrom and corresponding to the container content data signal set. A system for tracking items in an assembly includes an apparatus for receiving electromagnetic identification tag signals; an apparatus for creating a first tier aggregate signature; an apparatus for storing the signature in a master database; and an apparatus for receiving modifying command signals for creating a second tier aggregate signature corresponding to a modified set of electromagnetic identification tags in an augmented assembly.

 
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