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The Pen has had a great important throughout the ages . Using pens , people write and express their opinions . Using pens , peace agreements are signed . Using pens , History and Sciences are written and dated . Pens are very important and have an important role despite their small sizes . That's amazing !

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A ballpoint pen, introduced in 1940, dispenses an oil based ink by rolling a small hard sphere, usually 0.5–1.2 mm and made of brass, steel or tungsten carbide.[3] The ink dries almost immediately on contact with paper. The ballpoint pen is usually reliable and comes in both inexpensive and expensive types. It has replaced the fountain pen as the most common tool for everyday writing.

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A fountain pen, introduced in 1880, uses water-based liquid ink delivered through a nib. The ink flows from a reservoir through a "feed" to the nib, then through the nib, due to capillary action and gravity. The nib has no moving parts and delivers ink through a thin slit to the writing surface. A fountain pen reservoir can be refillable or disposable, this disposable type being an ink cartridge. A pen with a refillable reservoir may have a mechanism, such as a piston, to draw ink from a bottle through the nib, or it may require refilling with an eyedropper.

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In the 1960s, the fiber or felt-tipped pen was invented by Yukio Horie of the Tokyo Stationery Company, Japan.[15] Papermate's Flair was among the first felt-tip pens to hit the U.S. market in the 1960s, and it has been the leader ever since. Marker pens and highlighters, both similar to felt pens have become popular in recent times.

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Rollerball pens were introduced in the early 1970s. They make use of a mobile ball and liquid ink to produce a smoother line. Technological advances achieved during the late 1980s and early 1990s have improved the roller ball's overall performance. A porous point pen contains a point that is made of some porous material such as felt or ceramic. A high quality drafting pen will usually have a ceramic tip, since this wears well and does not broaden when pressure is applied while writing.

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1915 advertisement for "Vulcan" Ink Pencils.

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The earliest historical record of a pen employing a reservoir dates back to the 10th century. In 953, Ma'ād al-Mu'izz, the Fatimid Caliph of Egypt, demanded a pen which would not stain his hands or clothes, and was provided with a pen which held ink in a reservoir and delivered it to the nib.This pen may have been a fountain pen, but its mechanism remains unknown, and only one record mentioning it has been found.

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A copper nib was found in the ruins of Pompeii showing that metal nibs were used in the year 79. A metal pen point was patented in 1803 but the patent was not commercially exploited. A patent for the manufacture of metal pens was advertised for sale by Bryan Donkin in 1811.[10] John Mitchell of Birmingham started to mass-produce pens with metal nibs in 1822, and thereafter the quality of steel nibs had improved enough that dip pens with metal nibs came into generalized use.

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The reed pen survived until papyrus was replaced by animal skins, vellum and parchment, as a writing surface. The smoother surface of skin allowed finer, smaller writing by the quill pen, derived from the flight feather.  Quill pens were still widely used in the 18th century, and were used to write and sign the Constitution of the United States in 1787.

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Ancient Egyptians had developed writing on papyrus scrolls when scribes used thin reed brushes or reed pens . Reed pens continued to be used until the Middle Ages . The reed pen, generally made from bamboo, is still used in some parts of Pakistan by young students and is used to write on small boards made of timber .