A laser marking apparatus has a number of individual laser devices (1) mounted at angles to one another. The output ends (2) of the laser devices are disposed closely adjacent to one another and a number of laser beam redirectors (5) are disposed to intercept the laser beams (3) emitted from the laser...http://www.google.com/patents/US6421159?utm_source=gb-gplus-sharePatent US6421159 - Multiple beam laser marking apparatus
