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Meta Search Engines

https://en.wikipedia.org/wiki/Metasearch_engine

A metasearch engine (or search aggregator) is an online Information retrieval tool that uses the data of a web search engine to produce its own results. Metasearch engines take input from a user and immediately query search engines for results. Sufficient data is gathered, ranked, and presented to the users.

§ Aggregation by position

§ Aggregation by value