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  2. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  3. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    California Penal Code sections were in use by the Los Angeles Police Department as early as the 1940s, and these Hundred Code numbers are still used today instead of the corresponding ten-code. Generally these are given as two sets of numbers [ citation needed ] —"One Eighty-Seven" or "Fifty-One Fifty"—with a few exceptions such as "459 ...

  4. List of highest-income ZIP Code Tabulation Areas in the ...

    en.wikipedia.org/wiki/List_of_highest-income_ZIP...

    ZCTAs or ZIP Code Tabulation Areas are the census equivalent of ZIP codes used for statistical purposes. The reason why regular ZIP codes are not used is because they are defined by routes rather than geographic boundaries. Thus, they have the tendency to overlap and otherwise create difficulties.

  5. MARPOL 73/78 - Wikipedia

    en.wikipedia.org/wiki/MARPOL_73/78

    The International Convention for the Prevention of Pollution from Ships, 1973 as modified by the Protocol of 1978, or "MARPOL 73/78" (short for "marine pollution") is one of the most important international marine environmental conventions. [2]

  6. World record progression 50 metres freestyle - Wikipedia

    en.wikipedia.org/wiki/World_record_progression...

    The first world record in the men's 50 metres freestyle in long course (50 metres) swimming was recognized by the International Swimming Federation (FINA) in 1976.In short course (25 metres) swimming events the world's governing body recognizes world records since March 3, 1991.

  7. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

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