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  2. Reverse 1-1-2 - Wikipedia

    en.wikipedia.org/wiki/Reverse_1-1-2

    Reverse 1-1-2 is a public safety communications technology used by public safety organizations throughout the world to communicate with groups of people in a defined geographic area. Reverse 1-1--2 allows authorities to rapidly warn those in danger, directly through their mobile phones.

  3. 411 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/411_(telephone_number)

    411 is a telephone number for local directory assistance in Canada and the United States. Until the early 1980s, 411 – and the related 113 number – were free to call in most jurisdictions. In the United States, the service is commonly known as "information", [1] although its official name is "directory assistance". [2]

  4. Regenerative fuel cell - Wikipedia

    en.wikipedia.org/wiki/Regenerative_fuel_cell

    A regenerative fuel cell or reverse fuel cell (RFC) is a fuel cell run in reverse mode, which consumes electricity and chemical B to produce chemical A. By definition, the process of any fuel cell could be reversed. [ 1 ]

  5. Reverse transcriptase - Wikipedia

    en.wikipedia.org/wiki/Reverse_transcriptase

    A reverse transcriptase (RT) is an enzyme used to convert RNA genome to DNA, a process termed reverse transcription.Reverse transcriptases are used by viruses such as HIV and hepatitis B to replicate their genomes, by retrotransposon mobile genetic elements to proliferate within the host genome, and by eukaryotic cells to extend the telomeres at the ends of their linear chromosomes.

  6. 555 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/555_(telephone_number)

    The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-...., in each numbering plan area (NPA) (area code).

  7. 1-800-FREE-411 - Wikipedia

    en.wikipedia.org/wiki/1-800-FREE-411

    Callers dial 1-800 (888 or 866)-FREE411 [373-3411] from any phone in the United States to use the toll-free service. Sponsors cover part of the service cost by playing advertising messages during the call.

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