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To bind a document, the user first punches holes in the paper with a specialized hole punch. Pages must be punched a few at a time with most of these machines. If hard covers are desired, they must be punched as well. In bulk applications, a paper drilling machine may be used. Then the user chooses a spine size that will match the document.
A four-hole extension to ISO 838 is also in common use. Two holes are punched in accordance with the standard, plus two additional holes located 80 mm to the outside of the standard holes. The two additional holes provide more stability in 4-ring binders, while still allowing 4-hole paper to fit 2-ring binders.
German Friedrich Soennecken invented ring binders in 1886 in Bonn. [2] [3] He also registered a patent on 14 November 1886 for his Papierlocher für Sammelmappen ("paper punch for binders", or hole punch). [3] German Louis Leitz, founder of Leitz, later made some important changes to the development of ring binders in Stuttgart. [4]
With this binding method, users insert their punched pages onto a C-shaped spine, and then use a wire closer to squeeze the spine until it is round. [1] Documents that are bound with wire binding will open completely flat on a desk, and allow for 360 degree rotation of bound pages, without the side protrusion produced by spiral binding.
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After printing the separated sheets can be held in binders by using the sprocket holes when simply required as a record. Alternatively some types of continuous form paper also have longitudinal perforations along each edge inside the engagement holes, allowing the strips with sprocket holes to be torn off the printed page.
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