Oil field equipment, namely, drilling rig mechanization devices in the nature of bridge plugs, frac plugs, packers and ball sealers used in an oil and gas wellbore; rock drilling machines for downhole, and their parts and fittings, namely, bridge plugs, frac plugs, packers and ball sealers that are used in an oil and gas wellbore; mining machines and apparatus and their parts and fittings, namely, bridge plugs, frac plugs, packers and ball sealers that are used in an oil and gas wellbore