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Xerography (electrostatic process or electrophotography) is a dry photocopying technique invented by Chester Carlson in 1938, for which he was awarded a U.S. Patent on October 6, 1942.
Carlson originally called his invention "electrophotography" It was later renamed xerography mdash; from the Greek roots xeros (dry) and graphos (writing) — to emphasize that, unlike reproduction techniques then in use such as cyanotype, this process used no liquid chemicals.
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