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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. Free trade - Wikipedia

    en.wikipedia.org/wiki/Free_trade

    Free trade is a trade policy that does not restrict imports or exports. ... Consumers are made worse off because the consumer surplus (green region) becomes smaller ...

  4. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Some geographic area codes are similar to the toll-free codes, e.g., 801, 818, 860. Toll-free numbers are also sometimes confused with 900-numbers, for which the telephone company bills the callers at rates far in excess of long-distance service rates for services such as recorded information or live chat.

  5. 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 ...

  6. Free-software license - Wikipedia

    en.wikipedia.org/wiki/Free-software_license

    In the mid-1980s, the GNU project produced copyleft free-software licenses for each of its software packages. An early such license (the "GNU Emacs Copying Permission Notice") was used for GNU Emacs in 1985, [5] which was revised into the "GNU Emacs General Public License" in late 1985, and clarified in March 1987 and February 1988.

  7. Title 50 of the United States Code - Wikipedia

    en.wikipedia.org/wiki/Title_50_of_the_United...

    Title 50 of the United States Code outlines the role of War and National Defense in the United States Code. Chapter 1: Council of National Defense; Chapter 2: Board of Ordnance and Fortification (repealed) Chapter 3: Alien Enemies; Chapter 4: Espionage (repealed/transferred)

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