A system for localizing a zone in space in relation to a predetermined point on a surface, wherein the surface is divided into nine zones of first rank obtained by dividing the surface into three parts in two different directions, a predetermined respective number from 1 to 9 is attributed to each of...http://www.google.de/patents/US7065886?utm_source=gb-gplus-sharePatent US7065886 - Measurement and localization system using bases three and nine and corresponding applications
