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vacuum cleaner
A vacuum cleaner is a device that uses an air pump (a centrifugal fan in all but some of the very oldest models), to create a partial vacuum to suck up dust and dirt, usually from floors, and from other surfaces such as upholstery and draperies. The dirt is collected by either a dustbag or a cyclone for later disposal. Vacuum cleaners, which are used in homes as well as in industry, exist in a variety of sizes and models—small battery-powered hand-held devices, wheeled canister models for home use, domestic central vacuum cleaners, huge stationary industrial appliances that can handle several hundred litres of dust before being emptied, and self-propelled vacuum trucks for recovery of large spills or removal of contaminated soil. Specialized shop vacuums can be used to suck up both dust and liquids.
== Name ==
Although "vacuum cleaner" is a neutral name, in some countries (UK, Ireland) "hoover" is used instead as a genericized trademark, after one of the first and more influential companies in the development of the device, but actually irrespective of the brand used (like kleenex for facial tissue).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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