Drilling services; earth drilling including drilling of wells and shafts; mining extraction; installation, rental, maintenance and repair of machines and machine tools including drills and parts therefor in this class, motors and engines (except for land vehicles) including motors and engines for drills, machine coupling and transmission components (except for land vehicles) including couplings and transmission components for drills, agricultural implements, earth drilling machines and parts therefor in this class including bearings, bits, heads, extractors, exhausts, drilling rigs, mills and milling machines, ore treating machines, sifting and sizing machines