A moving object detecting apparatus, an abnormality alarm apparatus, and a load-carrying compartment opening control apparatus each have an oscillator circuit, an antenna, and a frequency fluctuation detector. If a moving object, such as a human or the like, exists near the antenna when a signal from...http://www.google.com.au/patents/US6339376?utm_source=gb-gplus-sharePatent US6339376 - Automotive cargo space occupant detector
