A packing spring for a steam turbine comprising a flat, elongated spring body of specified length, width and thickness dimensions; a flange at one end of the main spring body; and at least one bend in the main spring body, located substantially midway along the length dimension of the spring body. A method of manufacturing a NAND flash memory device includes providing the semiconductor substrate and forming the oxide film in the semiconductor substrate at each of the first side and the second side of the gate of the source select transistor. Thus the user can carry the notebook computer with the cosmetic set together as one single item instead of carrying two separate items. In other embodiments, the system may also have more than two detectors arrays andor more than one source array.