| http://www.w3.org/ns/prov#value | - A further embodiment of the invention for measurement of fluid flow and other parameters in a fluid-filled pipe, is depicted in FIGS. 28A-28C. The illustrated configuration utilizes a transducer assembly 280 having a contoured shoe element 281, which provides a selected contact region between transducer assembly 280 and pipe 282, and which has a shoe thickness Y, in the measurement plane, which is
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