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  2. Engineering drawing - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing

    A common use is to specify the geometry necessary for the construction of a component and is called a detail drawing. Usually, a number of drawings are necessary to completely specify even a simple component. These drawings are linked together by a "master drawing." This "master drawing" is more commonly known as an assembly drawing.

  3. List of Chinese inventions - Wikipedia

    en.wikipedia.org/wiki/List_of_Chinese_inventions

    The following is a list of the Four Great Inventions—as designated by Joseph Needham (1900–1995), a British scientist, author and sinologist known for his research on the history of Chinese science and technology.