Artur Fischer from plastic materials (Polyamide) and is available in various shapes and sizes since 1958 (see Wall plug). Fischer held over 1100 patents and overtook Thomas Alva Edison, who held 1093 patents. Fischer also held 5867 trade rights and invented fischertechnik. Further inventions are (bone-)plugs for fixing bone fractures and one of Fischer’s most recent inventions is a gadget that makes it possible to hold and cut the top off an egg of any size. He got started on the problem when a hotel owner complained to him that his guests, on opening their boiled eggs for breakfast, always made a
Derwent World Patents Index grouped around a Basic patent, which is usually the first published example of the invention. All subsequent filings are referred back to the Basic patent, and are referred to as Equivalent patents. On this basis, the database has some 20 million "inventions", corresponding to tens of millions of patents, with almost a million new inventions added each year. From 2008, the number format of the Basic patent identifier (the Accession number) changed, to allow up to 3.6 million records per year to be added, as the previous format only allowed a maximum of 1 million new records a year. This