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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.

  3. Election ink - Wikipedia

    en.wikipedia.org/wiki/Election_ink

    Marker pens are the most efficient use of ink, with one 5 ml pen able to mark 600 people, although dipping bottles are often preferred, despite a 100 ml bottle only marking 1000. [citation needed] Dipping bottles can leave a more comprehensive stain with slightly greater longevity (depending on silver nitrate content) than markers can. However ...

  4. Pen register - Wikipedia

    en.wikipedia.org/wiki/Pen_register

    A pen register, or dialed number recorder (DNR), is a device that records all numbers called from a particular telephone line. [1] The term has come to include any device or program that performs similar functions to an original pen register, including programs monitoring Internet communications.

  5. Screen-printed electrodes - Wikipedia

    en.wikipedia.org/wiki/Screen-printed_electrodes

    Screen-printed electrodes (SPEs) are electrochemical measurement devices that are manufactured by printing different types of ink on plastic or ceramic substrates, allowing quick in-situ analysis with high reproducibility, sensitivity and accuracy.

  6. Waterman Philéas - Wikipedia

    en.wikipedia.org/wiki/Waterman_Philéas

    Waterman Philéas fountain pen. Waterman Philéas is a series of writing instruments including fountain pens, rollerballs, ballpoints and pencils produced by the Waterman pen company. It is well-known because of its good price-quality ratio and is therefore often recommended for novice fountain pen users and collectors. This series is now ...

  7. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means, such as heat or ultraviolet light. Invisible ink is one form of steganography.

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