An encoder-decoder for processing entropy encoded data. Tool users can easily maintain a synergistic relationship between orders from multiple demand sources or ordering systems. The self-healing mixture may be encapsulated to form self-healing capsules which may be dispersed in a polymer to fabricate self-healing material. It is therefore possible to adapt the conductor tracks to corresponding connector types or different position detecting devices without having to replace the entire board or housing while ensuring an extremely reliable contacting. In the brushless motor apparatus, r1r2<2R, where r1 is an internal resistance of the switching section in an ON state, r2 is a resistance of the line connecting the motor section and the switching section, and R is a direct current resistance of each of the three-phase coils. A controller estimates a pressure within an intermediate purge passage of the purge passage located between the check valve and the purge valve without relying on the use of a separate pressure detection device to provide information regarding the same.