The invention relates to a high-frequency filter comprising a block-like housing made of a dielectric material, the housing comprising ends and side surfaces, the section between the ends being provided with a conductive plating acting as the filter’s outer conductor. Specifically, at least two different connecting elements are picked up by the intermediate reservoir, and of the several connecting elements accommodated in the intermediate reservoir an arbitrary one determined by the processing operation is selected for the second step and conveyed to the loading device. Adjustment of the ballast voltage controls the output power of the tubes. Bicomponent fibers having a common core polymer and different sheath polymers can be extruded from alternate spinneret orifices in the same die plate. The main surface of the substrate is tilted from a 0001 plane by an angle in a range of 13 to 90 inclusive. The indicating potion is provided on an outer surface of the endless belt so as to have a positional relationship with an applied region of the lubricant with respect to the circumferential direction.