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2. Process of tattooing - Wikipedia

   en.wikipedia.org/wiki/Process_of_tattooing

   In 1891 the first electric tattoo needle was patented in New York City by Samuel O'Reilly, who modified Thomas Edison's electric engraving pen. [3] O'Reilly's machine was based on the rotary technology of the electric engraving device invented by Thomas Edison. [4] Modern tattoo machines use electromagnetic coils.

3. Power tool - Wikipedia

   en.wikipedia.org/wiki/Power_tool

   The cast metal housings were heavy, contributing to repetitive use injuries, as well as conductive - often shocking the user. As Henry Ford adapted to the manufacturing needs of World War II, he requested that A. H. Peterson, a tool manufacturer, create a lighter electric drill that was more portable for his assembly line workers. [19]

4. Electric pen - Wikipedia

   en.wikipedia.org/wiki/Electric_pen

   The electric pen was the key component of a complete duplicating system, which included the pen, a cast-iron holder with a wooden insert, a wet cell battery on a cast-iron stand, and a cast-iron flatbed duplicating press with an ink roller.

5. 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.

6. Engraving - Wikipedia

   en.wikipedia.org/wiki/Engraving

   Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving. Steel engraving is the same technique, on steel or steel-faced plates, and was mostly used for banknotes, illustrations for books, magazines and reproductive prints, letterheads and similar uses from about 1790 to the early 20th century, when the technique became less popular, except ...

7. Active pen - Wikipedia

   en.wikipedia.org/wiki/Active_pen

   The active pen marketplace has long been dominated by N-trig [2] and Wacom, [3] but newer firms Atmel [4] and Synaptics [5] also offer active pen designs. An active pen is generally larger and has more features than a stylus. Digital pens typically contain internal electronics and have features such as touch sensitivity, input buttons, memory ...