| http://www.w3.org/ns/prov#value | - An object locating system comprising a compressional wave projector, a detector responsive to reflections of waves propagated by said projector, said detector including two bidirectional electromechanical translating units and a substantially non-directional electromechanical translating unit, three balanced amplifiers each connected to a corresponding one of said units and having the same time va
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