A family of laser evolved models providing laser surgical teaching and proficiency practice targetry. A first model element, comprising a rectangular sheet of laser impervious material having arrays of laser vaporizable markings imprinted thereon, provides targetry for exercising controls of a surgical...http://www.google.com.tw/patents/US4767333?utm_source=gb-gplus-share專利 US4767333 - Laser evolved models
