|
| US4122346 | 23 mars 1977 | 24 oct. 1978 | High Voltage Engineering Corporation | Optical devices for computed transaxial tomography |
| US5371371 | 27 août 1993 | 6 déc. 1994 | Kabushiki Kaisha Toshiba | Magnetic immersion field emission electron gun systems capable of reducing aberration of electrostatic lens |
| US7759652 | 16 mai 2007 | 20 juil. 2010 | Hitachi High-Technologies Corporation | Electron lens and charged particle beam apparatus |
