A system and method for retrieving certificate of trust information for a certificate validation process. The pivot head wrench is switchable between lock and unlock modes. The displacement preventing spacer includes a load receiving part which is brought into engagement with the adjacent upper flanges andor lower flanges to receive an active load incurred by the individual steel beams 4 so as to inhibit the steel beams 4 from displacing downward. The adjacent pixel adding unit adds the values of the pixel divisions protruding from the pre-shift range of the array of pixel divisions to the column of contracted pixels of the pixel adjacent in the protruding direction. A browsing device includes a display configured and adapted to display to a second user a representation of a local geographical area, and to selectively display to the second user content information associated with the first user, based at least in part on whether the location of the beacon device is within the local geographical area. The direction of the tooth trace of the other two helical gears is set so that at least one of them produces a bending moment in an opposite direction to the first bending moment.