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  2. Duplicating machines - Wikipedia

    en.wikipedia.org/wiki/Duplicating_machines

    When spread over 20 or more copies, the cost per copy (2 to 4 cents) is close to photocopiers. But for every additional copy, the average cost decreases. At 100 prints, the master cost per copy was only 0.4–0.8 cents per copy, and the cost of the paper printed upon will start to dominate.

  3. Rhind Mathematical Papyrus 2/n table - Wikipedia

    en.wikipedia.org/wiki/Rhind_Mathematical_Papyrus...

    The Rhind Mathematical Papyrus, [1][2] an ancient Egyptian mathematical work, includes a mathematical table for converting rational numbers of the form 2/ n into Egyptian fractions (sums of distinct unit fractions), the form the Egyptians used to write fractional numbers. The text describes the representation of 50 rational numbers.

  4. Mimeograph - Wikipedia

    en.wikipedia.org/wiki/Mimeograph

    A mimeograph machine (often abbreviated to mimeo, sometimes called a stencil duplicator or stencil machine) was a low-cost duplicating machine that worked by forcing ink through a stencil onto paper. [1] The process was called mimeography, and a copy made by the process was a mimeograph. Mimeographs, along with spirit duplicators and ...

  5. Cryptanalysis of the Lorenz cipher - Wikipedia

    en.wikipedia.org/wiki/Cryptanalysis_of_the...

    Cryptanalysis of the Lorenz cipher was the process that enabled the British to read high-level German army messages during World War II.The British Government Code and Cypher School (GC&CS) at Bletchley Park decrypted many communications between the Oberkommando der Wehrmacht (OKW, German High Command) in Berlin and their army commands throughout occupied Europe, some of which were signed ...

  6. A. B. Dick Company - Wikipedia

    en.wikipedia.org/wiki/A._B._Dick_Company

    The company was founded in 1883 [1] in Chicago as a lumber company by Albert Blake Dick (1856 – 1934). It soon expanded into office supplies and, after licensing key autographic printing patents from Thomas Edison, became the world's largest manufacturer of mimeograph equipment (Albert Dick coined the word "mimeograph"). [3]

  7. Xerox 914 - Wikipedia

    en.wikipedia.org/wiki/Xerox_914

    The Xerox 914 was the first successful commercial plain paper copier. Introduced in 1959 by the Haloid/Xerox company, it revolutionized the document-copying industry. The culmination of inventor Chester Carlson 's work on the xerographic process, the 914 was fast and economical. The copier was introduced to the public on September 16, 1959, in ...

  8. Continued fraction - Wikipedia

    en.wikipedia.org/wiki/Continued_fraction

    A finite regular continued fraction, where is a non-negative integer, is an integer, and is a positive integer, for . A continued fraction is a mathematical expression that can be writen as a fraction with a denominator that is a sum that contains another simple or continued fraction. Depending on whether this iteration terminates with a simple ...

  9. David Gestetner - Wikipedia

    en.wikipedia.org/wiki/David_Gestetner

    Inventor. David Gestetner (31 March 1854 – 8 March 1939) was the inventor of the Gestetner stencil duplicator, the first piece of office equipment that allowed production of numerous copies of documents quickly and inexpensively. He also invented a new kind of nail clipper. Gestetner was awarded the John Scott Medal by The Franklin Institute ...

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