A compressor may include a shell, first and second scrolls, a seal assembly, a modulation control chamber, and a modulation control valve. The invention includes a method of programming, reading and erasing the EEPROM device. The first rib and second rib define a first fluid flow channel extending along the outer wall. A mobile communication terminal receives the location information and requests the road guidance service and the supplementary information service. In case that a revision is branched into more than one revisions, each such revision will constitute a different progression path.