There is provided a projection exposure system operable in a scanning mode along a scanning direction. Raw material formed into the hand tool is firstly hardened by heat treatment. The core so manufactured can be inserted into a laminatable pouch and laminated to the core to form a tamper resistant identification card. The ascorbic acid andor an ascorbic acid derivative in an ascorbic acid equivalent is provided in an amount of 2 ppm to 130 ppm of the oil and fat composition. The hot exhaust gas of a thermal engine can be supplied to the heat exchanger.