23 FABRICATED AND WELDED TANKS WITH AGITATING AND/OR CONVEYOR MEANS, TROUGHS FOR MACHINERY FOR LIQUID-TREATING METALS AND OTHER MATERIALS, KETTLES WITH AGITATING EQUIPMENT, MIXERS, WASHERS, AND SCRUBBERS WITH AGITATING AND/OR CONVEYOR MEANS FOR HANDLING SOLUTIONS IN TREATING METAL ARTICLES, MECHANICAL EQUIPMENT FOR PICKLING OR CLEANING METAL, CONVEYORS-NAMELY, ROLLS OR HOOKS FOR FEEDING OR CARRYING METAL SHEETS AND ARTICLES-ROLLS FOR CONVEYORS AND FOR MACHINES FOR MANUFACTURE AND TREATMENT OF PAPER, TEXTILES, AND OTHER SHEET MATERIALS, AND CYLINDRICAL AND CABINET DRIERS FOR METAL SHEETS AND ARTICLES OF METAL