A multiplexer for laser range finders and the like has a plurality of laser transmitters disposed about the periphery thereof. Each of the laser transmitters transmits a beam which is substantially smaller than the return beam received by the laser receiver. The laser receiver and each of the laser transmitters...http://www.google.se/patents/US5883706?utm_source=gb-gplus-sharePatent US5883706 - Multiplexer for laser ranging devices and the like
