Vacuum cleaner
The vacuum cleaner evolved from the carpet sweeper via manual vacuum cleaners. The first manual models, using bellows, were developed in the 1860s, and the first motorized designs appeared at the turn of the 20th century, with the first decade being the boom decade.
Nilfisk
Nilfisk was founded in Denmark in 1906 by Peder Andersen Fisker (1875–1975) and Hans Marius Nielsen (1870–1954) as "Fisker & Nielsen". Originally the company produced electrical engines as the basic component in ventilators, kitchen elevators, drilling machines and, later on, the Nimbus motorcycle. The Nilfisk vacuum cleaner of 1910, weighed 17.5 kilos. Fisker took out a patent on this invention and later bought out Nielsen. The vacuum cleaner outsold the other products, and the other engine products were gradually phased out. By 1954, the company had sold 1 million vacuum cleaners.