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  2. The Hoover Company - Wikipedia

    en.wikipedia.org/wiki/The_Hoover_Company

    The Hoover Company is a home appliance company founded in Ohio, United States, in 1908.It also established a major base in the United Kingdom, where it dominated the electric vacuum cleaner industry during most of the 20th century, to the point where the Hoover brand name became synonymous with vacuum cleaners and vacuuming in the United Kingdom and Ireland.

  3. List of vacuum cleaners - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_cleaners

    This is a list of vacuum cleaners and robot vacuum cleaner manufacturers. A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from floors, and optionally from other surfaces as well. The dirt is gathered by either a dustbag or a rigid cartridge, which may be emptied and reused.

  4. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    Y – Vacuum half-wave rectifier (power diode) Z – Vacuum full-wave rectifier (dual power diode with common cathode) Following digits: model number and base type; For signal pentodes, an odd model number most often identified a variable-mu (remote-cutoff) tube, whereas an even number identified a 'high slope' (sharp-cutoff) tube

  5. Vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Vacuum_cleaner

    Unable to produce the design himself due to lack of funding, he sold the patent in 1908 to local leather goods manufacturer William Henry Hoover (1849–1932), who had Spangler's machine redesigned with a steel casing, casters, and attachments, founding the company that in 1922 was renamed the Hoover Company. Their first vacuum was the 1908 ...

  6. List of steam technology patents - Wikipedia

    en.wikipedia.org/wiki/List_of_steam_technology...

    DE 4005467 (A1), 1990, Blast pipe for steam locomotive - has control systems for varying pipe opening DE 4311775 (A1), 1994, Feedwater-preheater construction for preheating temperatures above 100 deg C for steam generators, in particular locomotive-type boilers

  7. Henry (vacuum) - Wikipedia

    en.wikipedia.org/wiki/Henry_(vacuum)

    Henry is the brand name given to a cylinder vacuum cleaner made and sold by Numatic International, and is the only mass-produced consumer vacuum cleaner still made in the United Kingdom. [1] It is most notable for its cartoon eyes and mouth on the body of the vacuum cleaner , making a face, with the hose connector or hose as its nose.

  8. Hooven-Owens-Rentschler - Wikipedia

    en.wikipedia.org/wiki/Hooven-Owens-Rentschler

    The firm was the successor to the firm of Owens, Ebert & Dyer (founded in 1845 by Job E. Owens) which went into receivership in 1876. [1]In 1882, George A. Rentschler, J. C. Hooven, Henry C. Sohn, George H. Helvey, and James E. Campbell merged the firm with the iron works of Sohn and Rentschler, [1] [2] and adopted the name Hooven, Owens, Rentschler Co.

  9. Vacuum - Wikipedia

    en.wikipedia.org/wiki/Vacuum

    Vacuum pump and bell jar for vacuum experiments, used in science education during the early 20th century, on display in the Schulhistorische Sammlung ('School Historical Museum'), Bremerhaven, Germany. A vacuum (pl.: vacuums or vacua) is space devoid of matter. The word is derived from the Latin adjective vacuus (neuter vacuum) meaning "vacant ...

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