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The Roots blower is one example of a vacuum pump. A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. [1]
The bag may be disposable, or designed to be cleaned and re-used. Bagless: In non-cyclonic bagless models, the role of the bag is taken by a removable container and a reusable filter, equivalent to a reusable fabric bag. Cyclonic separation: A vacuum cleaner employing this method is also bagless. It causes intake air to be cycled or spun so ...
The second USS Milwaukee (C-21) was a St. Louis-class protected cruiser in the United States Navy. Entering service in 1906, Milwaukee was deployed to the Pacific Ocean. On 13 January 1917, while aiding a grounded submarine, the cruiser grounded herself. The ship was decommissioned and sold for scrap in 1919.
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