A synthetic resin-made thrust sliding bearing 1 includes a synthetic resin-made upper casing 100, a synthetic resin-made lower casing 200, and a synthetic resin-made thrust bearing piece 300 interposed between the upper and lower casings 100 and 200. In embodiments, a bookmark is received from a client device at a media content service. This assumption allows \u201clearning\u201d the characteristics of the noise between speech pauses and, based on a noise estimate, to build different filters that reduce the noise. If the path request is determined to be undecideable, route discovery is performed with neighbors. The depth stop can be used with a drill bit and drill extender, where one or more depth stops provide multiple visual points of reference for the operator. Ceramic igniters also are provided that are obtainable from fabrication methods of the invention.