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  2. Pentel - Wikipedia

    en.wikipedia.org/wiki/Pentel

    Pentel Co., Ltd. (ぺんてる株式会社, Penteru Kabushiki Gaisha) is a privately-held Japanese manufacturing company of stationery products. The name comes from one of their first widely known products and is a portmanteau of the English words pen and pastel. [5] [6] Pentel is also the inventor of non-permanent marker technology.

  3. Mechanical pencil - Wikipedia

    en.wikipedia.org/wiki/Mechanical_pencil

    Pencils with sub-millimeter leads can usually hold multiple leads at the same time, reducing the frequency of refills. One exception was the Pentel 350 E, possibly Pentel's first mechanical pencil, [14] which could only hold a single stick of 0.5 mm lead. Refill leads can be bought in small tubes and inserted into the barrel as needed.

  4. Boston Marathon bombing - Wikipedia

    en.wikipedia.org/wiki/Boston_Marathon_bombing

    This is an accepted version of this page This is the latest accepted revision, reviewed on 24 December 2024. 2013 domestic terrorist attack in Boston, Massachusetts, U.S. "Boston attack" redirects here. For the incident in 1770, see Boston Massacre. "Boston bomber" redirects here. For the Douglas Boston bomber aircraft, see Douglas A-20 Havoc. Boston Marathon bombing Moments after the first ...

  5. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    The f-number N is given by: = where f is the focal length, and D is the diameter of the entrance pupil (effective aperture).It is customary to write f-numbers preceded by "f /", which forms a mathematical expression of the entrance pupil's diameter in terms of f and N. [1]

  6. Cooper Rush - Wikipedia

    en.wikipedia.org/wiki/Cooper_Rush

    In his redshirt season at Central Michigan, Rush was named the school's Scout Team Player of the Year.. As a freshman, although he began the season as the third-string quarterback, Rush was named the starter by the third game, after Cody Kater was injured (collarbone fracture) and his backup Alex Niznak could not move the offense against the New Hampshire Wildcats.

  7. Half-power point - Wikipedia

    en.wikipedia.org/wiki/Half-power_point

    The half-power point is the point at which the output power has dropped to half of its peak value; that is, at a level of approximately −3 dB. [1] [a]In filters, optical filters, and electronic amplifiers, [2] the half-power point is also known as half-power bandwidth and is a commonly used definition for the cutoff frequency.

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