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2. Rollerball pen - Wikipedia

   en.wikipedia.org/wiki/Rollerball_pen

   The "liquid-ink" type uses an ink and ink-supply system similar to a fountain pen, and they are designed to combine the convenience of a ballpoint pen with the smooth "wet ink" effect of a fountain pen. The "liquid-ink" type rollerball pens were introduced in 1963 by the Japanese company Ohto. [2] [3] The gel-ink type rollerball pens were ...

3. List of pen types, brands and companies - Wikipedia

   en.wikipedia.org/wiki/List_of_pen_types,_brands...

   A pen is a handheld device used to apply ink to a surface, usually paper, for writing or drawing. [1] Additional types of specialized pens are used in specific types of applications and environments such as in artwork, electronics, digital scanning and spaceflight, and computing.

4. Retractable pen - Wikipedia

   en.wikipedia.org/wiki/Retractable_pen

   A pen being clicked. A retractable pen is a type of ink pen that has a spring-loaded ink cartridge which retracts and extends outside a protective housing. By clicking downward on the top of the pen, the tip is extended and locks in place at the bottom of the housing for use.

5. Pen - Wikipedia

   en.wikipedia.org/wiki/Pen

   As such, gel pens might be considered a subcategory of rollerball pens; however, due to the widespread knowledge and use of the term 'gel pen', 'rollerball' is in practice typically reserved for pens which use liquid ink. [9] The lower viscosity of rollerball ink compared to oil-based ballpoint pen ink has several effects on the pen's performance.

6. Ballpoint pen - Wikipedia

   en.wikipedia.org/wiki/Ballpoint_pen

   A ballpoint pen, also known as a biro [1] (British English), ball pen (Hong Kong, Indian, Indonesian, Pakistani, and Philippine English), or dot pen [2] (Nepali English and South Asian English), is a pen that dispenses ink (usually in paste form) over a metal ball at its point, i.e., over a "ball point".

7. Fountain pen - Wikipedia

   en.wikipedia.org/wiki/Fountain_pen

   A fountain pen is a writing instrument that uses a metal nib to apply water-based ink, or special pigment ink—suitable for fountain pens—to paper. It is distinguished from earlier dip pens by using an internal reservoir to hold ink, eliminating the need to repeatedly dip the pen in an inkwell during use.