The assembly line was a system through which items were mass-produced in a flow.

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continuous

Explanation:

Assembly line can be defined as a form of production in which several workers, with the help of machines, specialize in specific and repetitive functions, working in a sequential, continuous way. This is the case when an industrial establishment with the aid of machines turns raw materials and semi-finished products into finished products intended for consumption. The most characteristic form, the one of the assembly in series, was invented by Henry Ford, American businessman of the auto industry.

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