Identification of firearms by illuminating a base of a fired cartridge from a firearm using axially homogenized light from various illumination angles using a holographic imaging system integrated into either a mono-chromatic or multi-chromatic light, obtaining a microscope image of an encoded hologram...http://www.google.com.au/patents/US6833911?utm_source=gb-gplus-sharePatent US6833911 - Method and apparatus for reading firearm microstamping
