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In 1919, physicist and university lecturer Frederick David Edwards and his father William founded their eponymous business in Camberwell, London, as Edwards Equipment and Services. They sold vacuum pumps to research laboratories from the UK, France, Germany and the USA. [17] [3] [2]
Edwards has over 3,200 full-time employees and 500 temporary workers operating in approximately 30 countries worldwide engaged in the design, manufacture and support of high technology vacuum and ...
Most general pumps can increase as well as decrease the pressure of a gas; however, this category contains pumps that are usually exclusively used to decrease pressure. Wikimedia Commons has media related to Vacuum pumps .
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]
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By the end of 1948, Aerojet had designed, built, and tested a liquid hydrogen pump (15 cm diameter). Initially, it used ball bearings that were run clean and dry, because the low temperature made conventional lubrication impractical. The pump was first operated at low speeds to allow its parts to cool down to operating temperature. When ...
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