Roll Crushers and Rotary Breakers for pit coal and gangue; Hammer Mills (Prallspalter) and Sizer, Single and Double Roll Crushers as well as Smooth Roll Crushers for coal; Hammer Mills (Prallspalter) for simultaneous crushing and drying; Roller Grates, Swivel Arm Crushers and Hammer Mills (Prallspalter) for coal handling systems; Hammer Mills (Prallspalter), Vibrating Mills and Crushing and Cooling Screws .