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  2. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    Police code. A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or ...

  3. Amazon Prime Air - Wikipedia

    en.wikipedia.org/wiki/Amazon_Prime_Air

    Amazon Prime Air, or simply Prime Air, is a drone delivery service operated by Amazon. The service uses delivery drones to autonomously fly individual packages to customers, and launched in 2022. [1] The service currently operates in two cities in the US, with plans to expand into the UK and Italy in 2024. [2]

  4. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Coupon. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product . Customarily, coupons are issued by manufacturers of consumer packaged goods [1] or by retailers, to be used in retail stores as a part of sales promotions. They are often widely distributed through mail ...

  5. Vowel reduction - Wikipedia

    en.wikipedia.org/wiki/Vowel_reduction

    Vowel reduction of second language speakers is a separate study. Stress-related vowel reduction is a principal factor in the development of Indo-European ablaut, as well as other changes reconstructed by historical linguistics. Vowel reduction is one of the sources of distinction between a spoken language and its written counterpart.

  6. Advent Corporation - Wikipedia

    en.wikipedia.org/wiki/Advent_Corporation

    Advent Corporation. An early stand-alone Advent Dolby noise reduction unit, for tape playback use only. Later models also supported recording on tape. Advent Corporation was a consumer audio and video hardware company founded in Cambridge, Massachusetts by Henry Kloss in 1967. It closed in 1981.

  7. Selective catalytic reduction - Wikipedia

    en.wikipedia.org/wiki/Selective_catalytic_reduction

    Selective catalytic reduction (SCR) means of converting nitrogen oxides, also referred to as NO x with the aid of a catalyst into diatomic nitrogen (N 2), and water (H 2 O). A reductant, typically anhydrous ammonia (NH 3), aqueous ammonia (NH 4 OH), or a urea (CO(NH 2) 2) solution, is added to a stream of flue or exhaust gas and is reacted onto ...

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