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Automatically Programmed Tool

APT (Automatically Programmed Tool) is a language for numerically controlled machines. APT uses English-like statements and symbolic notation for more complicated operations, making it easier to write programs without needing detailed knowledge of the numerical control hardware. Initially developed during the late 1950s at MIT's Servomechanisms Laboratory, in collaboration with a company called Bull Gear Inc., APT has evolved through several versions like APT II and III. While industrial CNC machines now use other languages like G-code or specific machine codes, APT played an essential role in automating manufacturing processes by allowing engineers to more easily program complex tool paths for cutting operations on early computerized machining tools.