| http://www.w3.org/ns/prov#value | - Apparatus for determining the distance between a radio transmitting system and a radio receiving system, said receiving system including five receiving stations, one of said stations being situated at the center of a circle and the remaining four being equally spaced around the periphery of said...http://www.google.com/patents/US3889266?utm_source=gb-gplus-sharePatent US3889266 - Multiple correlat
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