Factory production process of pulleys, glass cups, and large gears! Let's see how they are produced

Go to the pulley, glass cup, big gear factory shooting production teaching video!
Factory production process of pulleys, glass cups, and large gears! Let's see how they are produced
Factory production process of pulleys, glass cups, and large gears! Let's see how they are produced
Factory production process of pulleys, glass cups, and large gears! Let's see how they are produced

the pulley,large gears,