7 Machines and machine tools, namely, power operated sawing machines, power operated cutting machines and diamond-pointed metal-cutting tools; Motors and engines not for land vehicles; electric drills and drilling machines; parts for drilling machines and electric drills, namely, drill segments, drill rings, and core drilling bits; power-operated saws for use on natural stone, artificial stone, ceramics, refractory materials and construction materials including reinforced concrete, masonry and prestressed concrete; saw machines; tools and parts of milling machines, namely, milling segments and milling rings; grinding and polishing tools for grinding machines; parts for grinding machines, namely, grinding segments and grinding rings for grinding tools; machine fly-wheels, power-operated grinding wheels