Onye na-eme ka ndị na-ejikọta ọkụ maka ire ere maka ire ere na England Magnetic Drum Conveyor for Coal Handling Magnetic drum conveyor for coal handling (magnetic pulley) na-abụkarị maka ọgwụgwọ ọcha nke powdery, granular, obere ihe ngwongwo na iji ígwè na-arụ ọrụ ọka .
