Take a look at the evolution of tattooing tools from very primitive ones to the tattoo gun.
Ancient Egyptian Needles
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Ancient Thai Needle Kit
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Maori Chisel
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Polynesian Rake Needle
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Japanese Tebori Needles
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Edison's Electric Pen
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O'Reilly's Rotary Two Coil Needle
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Advanced Rotary Needle
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Modern Electro-Magnet Machine
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Source: buzzfeed