7 Construction and mining machines, namely, power drills, rotary power drills, earth drilling machines, power shovels, revolving power shovels, drag line excavators, walking drag line excavators, coal loaders, coal ploughs, shearer loaders, mechanical structural parts of coal loaders and attachments for use with the foregoing goods, namely, drag buckets, excavating dippers, excavator dipper teeth and lips; machine attachments, namely, drag buckets, excavating dippers, excavator dipper teeth and lips, excavator bucket teeth and lips, and replacement structural parts therefore; mining machinery, namely, power drills, rotary power drills, earth drilling machines, power shovels, revolving power shovels, drag line excavators, walking drag line excavators, coal loaders, coal ploughs, shearer loaders, hydraulic sports shields and shield-type supports; grinding and milling machines for minerals; mining equipment, namely, hydraulic support shield for machines, shield supports for machines and discharging shields for machines for mining and underground mine work and their structural parts; hydraulic engines not for land vehicles for mining; chain conveyors, machines, namely, conveyors; hydraulic controls for machines, motors, engines and mining machinery; pneumatic controls for machines, motors, engines and mining machinery