A fuel delivery system is provided for a combustion engine having an exhaust treatment device. Preferably computer-controlled, the apparatus follows the method of the invention to produce the workpiece by radiation and compacting of nx successive layers of powdered starting material, each subsequent layer being formed on the uppermost surface of the previously formed layer. That is, the user can select a battery to be used for traveling of the vehicle. The at least two pickoff sensors are affixed to the one or more flow conduits and the driver is configured to vibrate the one or more flow conduits. In another embodiment, the ambigram coin further comprises a displaying device coupled to a connecting device so that the ambigram coin is used worn as jewelry.