| http://www.w3.org/ns/prov#value | - By ensuring that the same quantity of propelled medium is moving at the same speed with the transmitted wave and against the reflectedwave, the transit time changes are equal, but of opposite sign, thus canceling each other.Although a vane-axial fan mounted equidistant from transmitter 50 and receiver 52 is the preferred embodiment, any fan or other air-moving means having the aforesaid characteri
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