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  2. Pentel - Wikipedia

    en.wikipedia.org/wiki/Pentel

    Demand for a Sign Pen was so extraordinary that the Tokyo factories could not supply all requests. [8] The Sign Pen was one of Pentel's most successful products with more than two billion units sold. [2] In 1971 the company changed its name to "Pentel Co. Ltd." and one year later, the green rollerball pen with water-based ink, was launched. [2]

  3. Technical pen - Wikipedia

    en.wikipedia.org/wiki/Technical_pen

    Staedtler technical pens Staedtler technical pen divided in parts in comparison with 1 cent euro coin 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 ...

  4. Uni-ball - Wikipedia

    en.wikipedia.org/wiki/Uni-ball

    In 1959, Mitsubishi released its first ballpoint pen, while its first mechanical pencil was launched in 1961. [3] In 1966, they began creating performance pens and by 1979 they developed the first "Uniball" rollerball pen, [11] which was the first ballpen with water-based ink and metallic tip. This pen would be a great success in Japan and ...

  5. Rain gauge - Wikipedia

    en.wikipedia.org/wiki/Rain_gauge

    The standard United States National Weather Service rain gauge, developed at the start of the 20th century, consists of an 8 in (200 mm) funnel emptying into a graduated cylinder, 2.525 in (64.1 mm) in diameter, which fits inside a larger container that is 8 in (200 mm) in diameter and 20 in (510 mm) tall. If the rainwater overflows the ...

  6. Microneedles - Wikipedia

    en.wikipedia.org/wiki/Microneedles

    Dermarollers are hand-held rollers equipped with a total of 192 solid steel micro-sized needles arranged into 24 arrays, lengths ranging from 0.5-1.5mm. [ 31 ] [ 33 ] With the growing popularity of microneedling, MNs have also been commodified into home care Dermarollers, which are similar to medical dermarollers, except that the needles are ...

  7. Birmingham gauge - Wikipedia

    en.wikipedia.org/wiki/Birmingham_gauge

    The gauge starts at the lowest gauge number of 5Ø or 00000, corresponding to the largest size of 0.500 inches (12.7 mm), and runs to the highest gauge number of 36, corresponding to the smallest size of 0.004 inches (0.10 mm).

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