Bits for power drills; Blades for power saws; Core drilling bits; Couplings for machines; Drill chucks for power drills; Grinding tools for grinding machines; Milling cutters; Milling cutters for milling machines; Motors and engines, except for land vehicles; Pressure switches and sensors for monitoring, controlling, and switching hydraulic or pneumatic systems being sold as a unit with manufacturing machines; Shaft couplings for machines