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.
agricultural machinery, implements, and accessories, particularly [ combined harvester-threshers (combines), threshing machines, corn shellers, ] power units (stationary 4 to 6 cylinder engines) [ , plows, middlebreakers, unit attachments for tilling, stalk cutters, harrows, planters, listers, ridge busters, rotary hoes, cultivators, manure spreaders, mowers, rakes, hay loaders, and grain drills ]