| 摘要 |
PROBLEM TO BE SOLVED: To leave a trace when a board box is tried to be illegally removed or forcibly opened.SOLUTION: A first seal part 34 (A) which seals a board box itself is set in the board box 30 with a gap provided from a peripheral part, and a second seal part 36 (B, E) which seals the coupling between the board box and a movable base part is set in the peripheral part. The first seal part is connected to the peripheral part by fragile joint parts 222c, 222d which intersect a gap between the first seal part and the second seal part in a horizontal direction. In addition, the fragile joint parts 222a, 222b and the like which intersect and connect in a vertical direction are provided in a gap between a region in the peripheral part where the second seal part is not set and the first seal part. When the second seal part or the other peripheral parts are touched, one of the fragile joint parts close to the region is broken by being subjected to shear force. Consequently, a trace of the illegal access to the board box is left. |
