Tireless Hauler!: mail bags on a conveyor belt. The B. F. Goodrich plant builds conveyor belts. Fabric is checked by running it around rollers. Huge belts are seen and smaller ones. Rubber vulcanizing machine. Men feed the rubber through the machine. A large slicing machine is used on the belts. A transmission belt is made and wound around. Shots of the conveyor belts at a supermarket.