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  2. Shewhart individuals control chart - Wikipedia

    en.wikipedia.org/wiki/Shewhart_individuals...

    Shewhart individuals control chart. In statistical quality control, the individual/moving-range chart is a type of control chart used to monitor variables data from a business or industrial process for which it is impractical to use rational subgroups. [1] The chart is necessary in the following situations: [2]: 231.

  3. History of postcards in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_postcards_in...

    The golden age of postcards is commonly defined in the United States as starting around 1905, peaking between 1907 and 1910, and ending by World War I. [4][5][6] Listed here are eras of production for specific types of postcards, as typically defined by deltiologists. Most of the dates are not fixed dates, but approximate points in time as ...

  4. Leitner system - Wikipedia

    en.wikipedia.org/wiki/Leitner_system

    An alternative method where incorrect answers are only moved back by one box. The Leitner system[1][2][3] is a widely used method of efficiently using flashcards that was proposed by the German science journalist Sebastian Leitner in 1972. [4][5] It is a simple implementation of the principle of spaced repetition, where cards are reviewed at ...

  5. American Greetings - Wikipedia

    en.wikipedia.org/wiki/American_Greetings

    American Greetings Corporation is a privately owned American company and is the world's second largest greeting card producer behind Hallmark Cards. [2][3] Based in Westlake, Ohio, a suburb of Cleveland, the company sells paper greeting cards, electronic greeting cards, gift packaging, stickers and party products.

  6. Lenticular printing - Wikipedia

    en.wikipedia.org/wiki/Lenticular_printing

    Appearance. Close-up of the surface of a lenticular print. Lenticular printing is a technology in which lenticular lenses (a technology also used for 3D displays) are used to produce printed images with an illusion of depth, or the ability to change or move as they are viewed from different angles. Examples include flip and animation effects ...

  7. Flashcard - Wikipedia

    en.wikipedia.org/wiki/Flashcard

    Flashcard. A set of flashcards demonstrating the Leitner system. Cards that the learner knows are promoted to a box for less frequent review (indicated by green arrows); cards for which the learner has forgotten the meaning are demoted to be studied more frequently (indicated by red arrows). A flashcard or flash card is a card bearing ...

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