| http://www.w3.org/ns/prov#value | - A system to detect cars or other objects existing within the detection area comprising a transmitter 100 to run and radiate radio frequencies (RFs) having a narrow-bandwidth by using a carrier frequency modulated by a certain LF tone; wherein the system includes a transponder 200 to respond the signal from the transmitter 100 to be radiated by the transmitter 100 to run and re-radiate the carrier
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