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Wikipedia definition
1. Restrictor plateA restrictor plate or air restrictor is a device installed at the intake of an engine to limit its power. This kind of system is occasionally used in road vehicles (e.g. , motorcycles) for insurance purposes, but mainly in automobile racing, to limit top speed and thus increase safety, to provide equal level of competition, and to lower costs; insurance purposes have also factored in for motorsports.
Read “Restrictor plate” on English Wikipedia
Read “リストリクター” on Japanese Wikipedia
Read “Restrictor plate” on DBpedia

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