A hollow-channel memory device comprises a source layer, a first hollow-channel pillar structure formed on the source layer, and a second hollow-channel pillar structure formed on the first hollow-channel pillar structure. Then, as to nodes which are recognized as change points of the shape of the driving path by a road node characteristic position detecting device 4, for example, a bending point or inflecting point, and a starting point and a terminating point of a curve path, a transition range is set ahead of and behind the nodes by a transition range setting device 5. When such an entry occurs, action is taken to reduce the likelihood of an unintentional giveaway of the sensitive data or to reduce the effects of an unintentional giveaway. A portion of the surface layer is heated at a heating temperature. A pumping mechanism is provided on the tool body, the pumping mechanism including upper and lower spur gear or gears.