Plural of conveyor; motorized belts or systems that continuously move materials or objects from one place to another in factories or facilities.
From 'conveyor' (which comes from 'convey' + '-or'), with the regular plural '-s'. The modern 'conveyor belt' became standard industrial equipment in the early 1900s.
Conveyor belts are so common in modern life—from airport luggage to grocery store checkouts to pizza place ovens—that we forget they completely changed how humans work and what we expect from manufacturing!
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