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.
Vacuum cleaner
The Hoover Company marketed an unusual vacuum cleaner, called the "Constellation", in the 1960s. The cylinder type lacked wheels, and instead the vacuum cleaner floated on its exhaust, operating as a hovercraft, although this is not true of the earliest models. They had a rotating hose with the intention being that the user would place the unit in the center of the room, and work around the cleaner. Introduced in 1954, they are collectible, and are easily identified by their spherical shape. But they remain an interesting machine; restored, they work well in homes with lots of hardwood floors.