A protective enclosure for an electronic device such as a laptop computer or tablet computer that comprises a shell that is capable of enclosing and substantially surrounding the electronic device. Each shift register element in the first path is paired with a respective shift register element in the second path. Releasing of the fuel from inside the spare tank is activated by power on the switch connected to a solenoid valve blocking the spare fuel suction pipe. The system is advantageously applied, for example, in TDD mode for the third mobile communications generation which combines a TDMA and CDMA subscriber separation method. By securing the tool or perforating assembly in one direction only the tool may be easily relocated or removed from the casing. The airfoil may include a wall, an internal cooling plenum, and a cooling hole extending through the wall to the cooling plenum.