Coal Handling Equipments Comprehensive Study by Type (Material Handling Equipment (Belt Conveyor, Screw Conveyor, Bucket Elevators, and Others), Crushing Equipment), Appliion (Surface Mining, Underground Mining, Crushing, Pulverizing Screening, Drills Breakers, Dust Collection), Equipments (Pull Chord Switch, Flap Gates, Metal Detector, Vibrating Feeder, Others), By Propulsion .