How is the location of packets and parcels updated by United Parcel Service (UPS) or Federal Express

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How is the location of packets and parcels updated by United Parcel Service (UPS) or Federal Express (Fedex)? Explain clearly.

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Introduction to Wireless and Mobile Systems

ISBN: ?978-1305087132

4th edition

Authors: Dharma P. Agrawal, Qing An Zeng

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