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  2. Bissell - Wikipedia

    en.wikipedia.org/wiki/Bissell

    Bissell Inc., also known as Bissell Homecare, is an American privately owned vacuum cleaner and floor care product manufacturing corporation headquartered in Walker, Michigan. [ 3 ] [ 4 ] The company is the number one manufacturer of floor care products in North America in terms of sales, with 20% marketshare.

  3. Melville Reuben Bissell - Wikipedia

    en.wikipedia.org/wiki/Melville_Reuben_Bissell

    Melville Reuben Bissell (September 25, 1843 – March 15, 1889) was an American entrepreneur who invented the modern carpet sweeper. [1] The Bissell corporation is named after him. Life and career

  4. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    Vacuum UV, or VUV, wavelengths (shorter than 200 nm) are strongly absorbed by molecular oxygen in the air, though the longer wavelengths around 150–200 nm can propagate through nitrogen. Scientific instruments can, therefore, use this spectral range by operating in an oxygen-free atmosphere (pure nitrogen, or argon for shorter wavelengths ...

  5. Television - Wikipedia

    en.wikipedia.org/wiki/Television

    The replacement of earlier cathode-ray tube (CRT) screen displays with compact, energy-efficient, flat-panel alternative technologies such as LCDs (both fluorescent-backlit and LED), OLED displays, and plasma displays was a hardware revolution that began with computer monitors

  6. Solid-propellant rocket - Wikipedia

    en.wikipedia.org/wiki/Solid-propellant_rocket

    Burn duration was two minutes. The nozzle throat was large enough to walk through standing up. The motor was capable of serving as a 1-to-1 replacement for the 8-engine Saturn I liquid-propellant first stage but was never used as such. Motor 260 SL-3 was of similar length and weight but had a maximum thrust of 24 MN (5,400,000 lbf) and a ...

  7. Timeline of astronomy - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_astronomy

    Mu'ayyad al-Din al-Urdi develops the Urdi lemma, which is later used in the Copernican heliocentric model. Nasir al-Din al-Tusi resolved significant problems in the Ptolemaic system by developing the Tusi-couple as an alternative to the physically problematic equant introduced by Ptolemy. [19] His Tusi-couple is later used in the Copernican model.

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