Abstract: Electron beam equipment fitted with a field emission electron gun (FEG) having an extractor electrode, an acceleration electrode, a repeller electrode disposed between the extractor electrode and the acceleration electrode, and a repeller power supply for applying a given voltage to the repeller electrode. Electrons extracted from the emitter collide against the extractor electrode, producing secondary electrons moving toward the acceleration electrode. The secondary electrons are repelled by the repeller electrode and thus prevented from reaching the specimen.

Abstract: An electronic mail cataloging and retrieving system comprises an electronic mail communication unit, an electronic mail storage unit for storing electronic mails, a tray information storage unit for storing information on classification types used for classification of electronic mails and a format for relating electronic mails to said classification types, an electronic mail object storage unit for storing an electronic mail object related to each electronic mail stored in the electronic mail storage unit, a header information display control unit for showing header information and electronic mail attribute information on a prescribed electronic mail in the form of an at-a-glance guide, a tray display control unit showing tray information which shows that a prescribed electronic mail is classified into a prescribed classification type, and an electronic mail editing means for showing and editing the content of an electronic mail.