An apparatus for determining the position and/or alignment of objects such as motor vehicle wheels, and including targets for attachment to the objects, a pair of optical sensing means such as television cameras for viewing the targets, an electronic processing means connected to the optical sensing...http://www.google.fr/patents/US5943783?utm_source=gb-gplus-shareBrevet US5943783 - Method and apparatus for determining the alignment of motor vehicle wheels
Method and apparatus for determining the alignment of motor vehicle wheels