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1). Vacuum Cleaners - How They Work By : Stefan Rockhaus
Most homes today have vacuum cleaners which are used for cleaning. It has been estimated that the "Whirlwind" was the first hand-powered cleaner that was made. It was invented in Chicago in 1865, and it has made cleaning a whole lot easier.
The functioning of a vacuum cleaner is dependant on air pressure. It sucks up air via the front, and releases it out of the end filter.
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