7
Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs.
[ ball bearings, roller bearings, and ] plain bearings; car pullers (power driven capstans or winches for pulling cars and heavy loads, [ warping boats, ] and operating hoists); belt conveyors, [ gravity discharge conveyors, ] pan conveyors, flight conveyors, bucket conveyors, en masse flow conveyors, screw conveyors, and parts thereof for coal and the like; apparatus for elevating, storing, and discharging coal and the like in mines, power plants, and locomotive coaling stations; [ coal tipples; ] skip hoists; [ apparatus for cleaning and washing coal; ] machines for crushing and sizing coal, sugar, chemicals, and similar friable materials; [ conveyor elevators for handling loads such as barrels, sacks, boxes, and similar warehouse receptacles; ] feeders of the conveyor type for withdrawing material from bins and hoppers in uniform volumes; gates, valves, and loading spouts for controlling and directing the flow of material in material handling equipment; glass batch mixers, conveyors, bucket elevators, and skip hoists; [ friction drum hoists, ] hand driven hoists, skip type hoists, and power driven hoists of generally mechanical nature; hoppers and bins for material handling equipment; journal boxes, belt pulleys, shafting, and drive and conveyor chains; mechanical loaders and unloaders for cars and boats and material pilers; [ mixing paddles; machines for washing sand, stone, ore, and the like; ] gear speed reducers; vibrating screens for separating materal according to size; [ power shovels; ] and gear transmission mechanisms