| http://www.w3.org/ns/prov#value | - Further, the remote system includes a database for storing information concerning a location of a subset of each of the plurality of mobile tractors and trailers. [0016] Yet another embodiment of the present invention is a method of maintaining a mobile tractor-trailer database for use in a position tracking system for a plurality of mobile tractors, mobile trailers, and fixed-location yards.
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