| http://www.w3.org/ns/prov#value | - It will be understood that although the coverage zones 26A, 26B and 26C are illustrated as having elliptical shapes, in many embodiments the actual shapes of the coverage zones 26A, 26B and 26C will typically not be perfectly elliptical, but will have a shape that is dependent upon a number of factors, including RF reflections or interference caused by nearby structures, the antenna pattern and mo
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