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  2. Mechanical pencil - Wikipedia

    en.wikipedia.org/wiki/Mechanical_pencil

    Several companies such as Pentel, Pilot, and Uni-ball (Mitsubishi Pencil Co.) currently manufacture colored refill leads in a limited range of diameters (0.5 mm, 0.7 mm, or 2.0 mm) for their own products, as well as "variety packs" consisting of different colors of leads for those who want to trial different colors of lead. Koh-i-Noor makes ...

  3. Pencil - Wikipedia

    en.wikipedia.org/wiki/Pencil

    Lead for mechanical pencils Flexible pencils. Mechanical pencils use mechanical methods to push lead through a hole at the end. These can be divided into two groups: with propelling pencils an internal mechanism is employed to push the lead out from an internal compartment, while clutch pencils merely hold the lead in place (the lead is ...

  4. Colored pencil - Wikipedia

    en.wikipedia.org/wiki/Colored_pencil

    A variety of colored pencils. A colored pencil (American English), coloured pencil (Commonwealth English), [1] colour pencil (Indian English), map pencil, [2] pencil crayon, or coloured/colouring lead (Canadian English, Newfoundland English) is a type of pencil constructed of a narrow, pigmented core encased in a wooden cylindrical case.

  5. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    This page was last edited on 16 November 2024, at 12:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  6. Hardness scales - Wikipedia

    en.wikipedia.org/wiki/Hardness_scales

    The scale of Pencil hardness This page was last edited on 11 February 2022, at 22:38 (UTC). Text is available under the Creative Commons ...

  7. Pentel - Wikipedia

    en.wikipedia.org/wiki/Pentel

    The first products for sale were released in 1951, followed by pencils in 1960. [ 2 ] In 1963 Pentel launched the "Sign Pen", a fibre-type pen that was used by then President of the United States Lyndon B. Johnson , who bought a dozen of them to sign photographs, apart from being adopted as the official writing instrument of NASA and going into ...

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