coal crushers grinding - Seaforth Lodge
US850988ACoal-crusher.Google Patents. This invention relates to a new and useful improvement ineoal-crushers, the objectbeing to provide a Crusher with a positive feed, whereby the coal to be reduced may be uniformly fed into the machine, and rotary beaters or hammers acting 'upon the material as 1t passes along an imperforate grinding-- 5 surface, the reduced material. being