The invention relates to a method of removing contaminants from a hydroprocessing feed stream. The item identifier is used in business transactions between the trading partners. Another topology selectively includes fixed or variable filter elements, thereby allowing the termination characteristics to be tuned for different levels of speed performance and power consumption. The front-stage lower catalyst layer contains an oxygen storage material. An opening space formed by the holes is filled with metallic paste by screen printing. As a result, the cam surface causes the engaging arm of the spring to be moved axially along the axle and more or less tension is applied to the torsional spring.