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
Margaret Wilcox Margaret Wilcox Margaret A. Wilcox, (born 1838, Chicago, Illinois) was an American engineer, and one of the first women mechanical engineers. She is notable for inventing the first automobile heater and the first combined clothes and dishwasher machine. Wilcox was one of the first female mechanical engineers. She was granted multiple US patents for her inventions. On November 23, 1893, she was granted a patent for the car heater. The car heater consisted of a combustion chamber located under the car, and pipes to transmit hot water. Her system redirected air that was over the engine to the inside of