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Pens (ペン, pen) are one of many writing instruments. Fountain pens, ballpoint pens, and sign pens are examples of different kind of pens.
Although universal as writing instruments, there are a wide variety of products in circulation, ranging from those specialized for specific tasks to those with some additional functionality.
ペンとは [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
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