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  2. Pager - Wikipedia

    en.wikipedia.org/wiki/Pager

    One-way pagers can only receive messages, while response pagers and two-way pagers can also acknowledge, reply to and originate messages using an internal transmitter. [3] Pagers operate as part of a paging system which includes one or more fixed transmitters (or in the case of response pagers and two-way pagers, one or more base stations ), as ...

  3. Iridium Communications - Wikipedia

    en.wikipedia.org/wiki/Iridium_Communications

    Pagers. Two pagers were made for the Iridium network – the Motorola 9501 and Kyocera SP-66K. These are one-way devices that could receive messages sent in the form of SMS. Other satellite phones. Several other Iridium-based telephones exist, such as payphones, and equipment intended for installation on ships and aircraft. The DPL handset made ...

  4. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    A siren with only one row of ports is called a single tone siren. A siren with two rows of ports is known as a dual tone siren. By placing a second stator over the main stator and attaching a solenoid to it, one can repeatedly close and open all of the stator ports thus creating a tone called a pulse. If this is done while the siren is wailing ...

  5. Pentagon Papers - Wikipedia

    en.wikipedia.org/wiki/Pentagon_Papers

    According to the Pentagon Papers, the U.S. government played a key role in the 1963 South Vietnamese coup, in which Diem was assassinated.While maintaining "clandestine contact" with Vietnamese generals planning a coup, the U.S. cut off its aid to President Diem and openly supported a successor government in what the authors called an "essentially leaderless Vietnam":

  6. Electroluminescence - Wikipedia

    en.wikipedia.org/wiki/Electroluminescence

    Examples of electroluminescent materials. Electroluminescent devices are fabricated using either organic or inorganic electroluminescent materials. The active materials are generally semiconductors of wide enough bandwidth to allow exit of the light. The most typical inorganic thin-film EL (TFEL) is ZnS:Mn with yellow-orange emission.

  7. Area code 386 - Wikipedia

    en.wikipedia.org/wiki/Area_code_386

    Area code 386, which was put into service in July 2001, is one of a few examples of how rapid population growth (and explosive growth in unexpected areas) coupled with an increase in auxiliary devices (such as cell phones and pagers) has led to some unusual, unorthodox, and often controversial solutions to dividing up "full" Area codes.

  8. Overlay plan - Wikipedia

    en.wikipedia.org/wiki/Overlay_plan

    Only one case, the first overlay area code in the NANPA, 917, was an example of this. It was established originally as an area code specifically for cellphones and pagers in New York City , but soon afterward, the FCC specified that area codes must not be service-specific, but it grandfathered this use for 917.

  9. Calculator spelling - Wikipedia

    en.wikipedia.org/wiki/Calculator_spelling

    Calculator spelling is an unintended characteristic of the seven-segments display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet.