The group's principal activities are to design, manufacture, market and serve charged particle beam systems. the products of the group include transmission electron microscopes, scanning electron microscopes, focused ion beam systems and products that incorporate an electron beam and an ion beam into a single system. the group's products are sold to semiconductor manufacturers, thin film head manufacturers in the data storage industry and to industrial and institutional organizations in the life science industries. in apr-2001, the group acquired deschutes corporation and surface/interface, inc. microelectronics accounted for 45% of 2001 revenues; Electron optics, 36%; Customer service, 15% and components, 4%.