In , George Devol, an inventor and entrepreneur, filed a patent describing an autonomous machine that could store step-by-step digital commands to move parts in a factory (he called it a "programmed article transfer" device). Devol teamed up with another entrepreneur, Joseph Engelberger, and they built a prototype in . They later started the first robotics company, Unimation, in Danbury, Conn. In , they put the first Unimate into service at a General Motors plant in Ewing Township, N.J., where the robot extracted hot metal parts from a casting machine. The first Unimates sold for US $35,000 in the early s (more than $200,000 in today's dollars). In , after acquiring Vicarm, a company that had invented an innovative robot arm design, Unimation introduced the PUMA, or Programmable Universal Machine for Assembly, which went on to become a popular robot in industrial and research settings. Unimation eventually grew to have 800 employees and $90 million in revenue in the early s, but sales declined as competition grew. Westinghouse acquired Unimation for $107 million in and transferred operations to Pittsburgh. Staubli, a French automation firm, later bought Unimation from Westinghouse.
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