German Friedrich Soennecken invented ring binders in in Bonn , Germany. German Louis Leitz , founder of Leitz later made some important changes in development of ring binders in Stuttgart-Feuerbach. Leitz introduced the hole in the side of the file. The two holes are 80mm apart, according to ISO The four-holes version has no ISO standard, the distances are 80mm, 80mm and 80mm 3x8.
Another design for ring binders was invented in by Andreas Tengwall in Helsingborg , Sweden and patented in under the name 'Trio binder', named after a business consortium of Tengwall and two associates. Tengwall's design uses four rings, two coming from each side in a forking fashion. These holes are 21mm, 70mm and 21mm apart.
In this article, it makes mention that, according to the curator of the Early Office Museum in London, the first patent for ring binders was filed in for a 2 ring binder. A few years later 3 ring binders became the standard in the US, and the "D" ring binders did not come on the market there until the s or 's.
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