Angular speed sensors and acceleration sensors are built into the casing of a video-type stereoscopic microscope. The first torque level is associated with a lower boom position of a boom. A category file is then created that indicates an association between each of the topics and corresponding subjects included in each topic. The guide plate and the activation push rod each have a break line, along which, before the assembly of the toggle switch, they were joined to each other in an integral fashion. In one example, the disambiguation process may include ranking potentially matching known entities according to a hierarchy of criteria.