A separator having at least: a base material layer made of a microporous membrane of a polyolefin resin; and a functional resin layer which is made of a resin different from the polyolefin resin and has a porous interconnected structure in which many holes are mutually interconnected. A default device encryption key associated with the electronic device is changed to correspond with a new device encryption key of the security server. The shaft can be movable between a first position and a second position relative to the contact wheel so as to bring the contact wheel into contact with the nosewheel of the aircraft. An outer ring is transfixed by the bolt, has an annular inner surface spaced outward from the inner-ring outer surface, and bears upward on the rail plate.