A multi-coordinate measuring system having a diffraction element that receives light emitted by a light source and diffracts the light into at least a first, second, third and fourth partial beam bundles where the first, second, third and fourth partial beam bundles are directed in different coordinate...http://www.google.de/patents/US5493397?utm_source=gb-gplus-sharePatent US5493397 - Multi-coordinate measuring system using a cross grating to create a plurality of diffraction beams emanating from two or more coordinate directions
