Conveyor | mechanical device | Britannica
In 1924 a conveyor belt was successfully used in an anthracite mine in central Pennsylvania to carry coal from a group of room conveyors to a string of cars at the mine entry. By the 1960s belts had almost completely replaced railcars for intermediate. coal mining: Conveyors. While use of conveyors for carrying coal over long distances from producing to consuming centres is uncommon, it is ...