An internal combustion engine having a fuel injector which functions as a positive displacement pump and dispenses an amount of fuel which is fixed for each and every operation of the injector, and a controller which controls the operation of the fuel injector. The apparatus includes an elastic clip integrally molded onto a lower surface of the housing and downwardly curved into a U-like shape in a bridge module in which a bridge of the power semiconductor protrudes through a through hole of the housing to be connected to a printed circuit board, whereby the power semiconductor is fixed by a force that the housing presses the power semiconductor. In displaying tomographic images acquired with a plurality of measuring beams, the display position of each tomographic image is adjusted based on the changed optical path length of a reference beam of the measuring beam used for the image. On a per call basis, the Simulated Facility Group System checks the available bandwidth on the IP Centrex Access Facility that serves the Centrex Group from which the call originated. As the pyrotechnic gas generator of the second stage gas source burns, the hot gaseous products of the second stage gas source mix with the pressurized gas stored in the first stage pressure vessel a predetermined time after the externally actuated valve opens.