USA Ballmill. Google Patents
The present invention is an improvement on the construction of ballmill forming the subjectmatter of my pending a pl'ication, Serial Number 750,893, filed Fe ma 26 1913; and While contemjilating the several objects and possessing the various advan stages of the structure of'seid lgiending application, the present mill is designed l epass only'minimum sized partieles the crushed material ...