What machine uses many grooved bearings?

There are many grooved bearings used in machines such as fans, motors and reducers. According to relevant information, the general types of machinery are fans, motors, reducers, etc. There are many bearings for personal use, but the amount of bearings is not large. These devices are widely used and the total amount is considerable. Monomer consumption includes textile machinery, wire drawing machine, wire drawing machine and winding machine for producing steel cord. A piece of equipment uses thousands of sets of bearings, all of which are very small.