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Multiple Machine Tool Setter / Operator / Tender, Metal and Plastic Tasks. 1  Set up and operate new machines and equipment for paper making, plastics and metals.  Perform routine maintenance on machines: clean, oil, replace worn-out parts and dull blades.
Before the 20th century, most calculations were done by humans. Early mechanical tools to help humans with digital calculations were called calculating machines, by proprietary names, or even as they are now, calculators. The machine operator was called the computer.