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.
Bag valve mask
The bag-valve mask concept was developed in 1953 by the German engineer Holger Hesse and his partner, Danish anaesthetist Henning Ruben, following their initial work on a suction pump. Later Hesse's company was renamed to Ambu, which has manufactured and marketed the device since the late 1950s. The full-form of AMBU is Artificial Manual Breathing Unit. An Ambu bag is a self-inflating bag resuscitator from the company Ambu, who still manufactures and markets self-inflating bag resuscitators.