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  2. Mechanical pencil - Wikipedia

    en.wikipedia.org/wiki/Mechanical_pencil

    Many other sizes were in use, however, before the Eversharp's success made its .046 inch lead size a de facto standard (this size has been variously metricized as 1.1, 1.18, and 1.2 mm, all nominal sizes). Thinner .036 inch (0.9 mm) lead was introduced in the later 1930s and gradually became the new standard, eventually being displaced by 0.7 mm.

  3. Rollerball pen - Wikipedia

    en.wikipedia.org/wiki/Rollerball_pen

    A gel-based rollerball pen. Roller ball pens or roll pens[1] are pens which use ball point writing mechanisms with water-based liquid or gelled ink, as opposed to the oil-based viscous inks found in ballpoint pens. These less viscous inks, which tend to saturate more deeply and more widely into paper than other types of ink, give roller ball ...

  4. Technical pen - Wikipedia

    en.wikipedia.org/wiki/Technical_pen

    Macro image of a 0.7 mm Rotring Rapidograph nib showing the flow control wire. A technical pen is a specialized instrument used by an engineer, architect, or drafter to make lines of constant width for architectural, engineering, or technical drawings. Technical pens may use either a refillable ink reservoir or a replaceable ink cartridge.

  5. Eversharp - Wikipedia

    en.wikipedia.org/wiki/Eversharp

    Eversharp is an American brand of writing implements founded by Charles Rood Keeran in 1913 and marketed by Keeran & Co., based in Chicago. [1] Keeran commercialised Eversharp mechanical pencils (manufactured by two companies, Heath and Wahl), [2] [1] then expanding to fountain pens when the company was acquired by the Wahl Adding Machine Co. in 1916 and it was named "Wahl-Eversharp".

  6. USS Pennsylvania (BB-38) - Wikipedia

    en.wikipedia.org/wiki/USS_Pennsylvania_(BB-38)

    USS Pennsylvania (BB-38) was the lead ship of the Pennsylvania class of super-dreadnought battleships built for the United States Navy in the 1910s. The Pennsylvanias were part of the standard-type battleship series, and marked an incremental improvement over the preceding Nevada class, carrying an extra pair of 14-inch (356 mm) guns for a total of twelve guns.

  7. Strike zone - Wikipedia

    en.wikipedia.org/wiki/Strike_zone

    The strike zone is a volume of space, a vertical right pentagonal prism. Its sides are vertical planes extending up from the edges of home plate.The official rules of Major League Baseball, define the top of the strike zone as the midpoint between the top of the batter's shoulders and the top of the uniform pants, and the bottom of the strike zone is at the hollow beneath the kneecap, both ...

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