Log entries are described that are stored in a log during a log session. The first filter section includes a first interdigital transducer group arranged in the surface acoustic wave propagation direction. One example of a rule defines relationships between and among a content event, predetermined content, and action to be taken concerning the predetermined content. A controllable mobile element modifies the flow of air entering the confined zone by varying a cross section of the air duct. Grid-like oil drain passage and corresponding core structures are disclosed herein; the oil drain passage structure comprises a plurality of vertical passages that are arranged longitudinally with respect to the cylinder block, wherein the vertical passages are interconnected by a connecting passage that runs longitudinally through the central portions of the vertical passages. The regulating member is switchable between a regulating state for regulating the solid lubricant not to separate from the lubricant applying member by more than the predetermined distance and a non-regulating state.