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==Historical overview==
CNC was preceded by [[numerical control|numerically controlled]] (NC) machines, which were hard-wired and their operating parameters could not be changed. NC was developed in the late 1940s and early 1950s by John T. Parsons in collaboration with the [[MIT]] Servomechanisms Laboratory. The first CNC systems used NC style hardware, and the computer was used for the tool compensation calculations and sometimes for editing.
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