| http://www.w3.org/ns/prov#value | - The switching of the DME from one ground station to the next sequential one is performed by the control unit 56 which is similar to the one shown in FIG. 2, except for the fact that it includes its own sequence-control stepping unit 57 which steps the DME through a sequence of channel selections and which moves on to the next selection after a time sufficient to permit the airborne DME to deliver
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