This excerpt taken from the FEIC 10-K filed Mar 14, 2005.
Our component products, which consist of electron and ion emitters and focusing columns, are manufactured with a variety of technical features to meet our needs and those of our customers. We sell our electron emitters primarily to manufacturers of electron beam equipment and scientific research facilities. Ion emitters are sold mainly to research and scientific facilities. We sell electron beam columns primarily to SEM manufacturers, and we sell ion beam columns primarily to manufacturers of surface analysis systems and other ion beam systems, as well as to research and scientific facilities. We also manufacture single crystal electron source rods and wire, which we sell to researchers and emitter manufacturers for use in electron emitter fabrication, SEM and TEM products and other research applications.